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Jenifer Lewis is begging climate change deniers to wake up and smell the smoke from Australia ... and believe the scientific facts she observed with her own eyes.

The "Black-ish" star was on "TMZ Live" Tuesday to make a passionate plea to save the planet from the effects of man-made pollution. She told us her recent trip to Antarctica inspired her to start speaking out -- and even write a song -- about the devastation climate change is causing around the world.

She says she spent 2-and-a-half weeks on a ship off the Antarctic coast and saw massive glaciers melting away, Jenifer told us it not only terrified her but moved the captain of her ship to tears.

Jenifer was already planning to sound the alarm when she got back to the U.S., and then the Australian wildfire news exploded around the world. She blames that tragedy on the "stupidity of humans."

Cardi B's potential political career is getting a boost from Presidential hopeful Bernie Sanders, who says she has the perfect background -- and no, he's not referring to "Bodak Yellow."

As you know, Cardi and Bernie have gotten pretty tight. She's obviously fond of him, but it's a two-way street ... because Sen. Sanders told us he's all for getting into politics, as she's recently hinted.

Sanders tells TMZ ... "Cardi B is deeply concerned about what's happening in the country. She knows what it's like to live in poverty and struggle, and it would be great for her to bring that experience to politics."

Cardi's shown an interest in politics for a while now, but as we reported ... she's now saying she's more serious about a run, and soon.

President Trump signed and delivered the 2 articles of impeachment against him ... to a guy who duped 45 into a very valuable autograph, which he's trying to hawk for big cash.

The Prez held a rally last month up in Battle Creek, MI and at one point, he apparently signed a paper handed to him by someone in the crowd. That signature, as it turns out, was scrawled on a copy of the House of Representatives' impeachment document.

We're told the guy who snagged the autograph printed out the report the day before the House formally voted to accuse POTUS of high crimes.

Now, this fella's partnered up with Goldin Auctions ... which we're told is expecting to get anywhere from $50k to $100k, with an opening bid of $4k. It's up for grabs on their site from Jan. 20 through Feb. 22.

It's funny ... a similar item featuring Trump's John Hancock made its way to the auction block last month -- an unwittingly signed copy of Trump's Oath of Office from a Pennsylvania rally.

D.L. Hughley is throwing his hands up in disgust at the American electorate, because he begrudgingly admits Cardi B could win office if she's serious about politics.

It's no secret the comedian isn't a fan of President Trump and told us the fact America elected a "game show host for a president" is proof knowledge and experience in politics no longer matter at all to the public. Translation: the door's wide open for Cardi.

Just because he believes it, doesn't mean he's happy about it -- D.L. points out several other professions where you'd NEVER hire someone with zero experience ... yet, voters seem willing to put anyone in high public office.

Cardi's been touting Sen. Bernie Sanders in the Democratic race, and he's surged ahead in the Iowa polls -- so, we asked Hughley if a Sanders-Almanzar ticket would be out of the question.

Rep. Nancy Pelosi is once again questioning President Trump's judgment on the Iran crisis after his open support for a doctored image of her and Sen. Chuck Schumer with the Iranian flag.

We got the Speaker of the House Monday leaving Washington D.C.'s Reagan Airport and asked her about Trump's early morning retweet of a photoshopped image showing herself and Schumer in Islamic garb. It was a random account with a mere 15,000 followers, but Trump blasted it out to his nearly 71 million followers.

Pelosi summed up the state of our democracy by repeating one of Trump's favorite social media phrases. A subtle counter-punch, for sure. She also took a bigger swipe, saying Trump doesn't know right from wrong.

As you know ... Republicans and Democrats are at odds over Trump's order to target and kill Iran's Gen. Qassem Soleimani, and the mudslinging is showing no signs of slowing down.

Donald Trump delivered a classy, gracious message to Cory Booker upon hearing the NJ Senator was no longer running for president -- just kidding! He taunted Booker so hard, he should get a 15-yard penalty.

POTUS fired off a tweet minutes after Booker announced he was suspending his campaign, saying ... "Really Big Breaking News (Kidding): Booker, who was in zero polling territory, just dropped out of the Democrat Presidential Primary Race."

Trump sarcastically added ... "Now I can rest easy tonight. I was sooo concerned that I would someday have to go head to head with him!"

Cardi B could be headed to the White House one day -- but first, she might try her hand at local government ... or perhaps, something in the middle.

The rapper tweeted Sunday what seemed to be a pretty serious idea of hers ... "I think I want to be a politician. I really love government even tho I don't agree with Goverment [sic]."

She followed up with an explainer, saying ... "No matter how many weapons a country have you need people! How are you trying to go against a country and possibly start a war when this country lacks patriotism? I barely see people claiming they LOVE being American."

Seems Cardi's talking about the U.S.-Iran conflict here. She finished by saying there's more she has to say on the subject and acknowledged she would have to do it later in a video. Unclear if that means Iran specifically, or politics in general. Stay tuned ...

LeVar Burton is shooting down the theory that America's more racist now than ever before ... saying the difference now is President Trump's emboldened racists to come out of the woodwork.

We got the iconic "Reading Rainbow" host out Thursday at LAX and just had to know if he thinks America's more racist now than ever ... what with Trump's administration establishing divisive policies since being ushered into the White House in 2016.

You'll remember Trump once described African nations as "shithole countries." His anti-immigrant rhetoric also inspired a Texas man to kill Hispanics at an El Paso Walmart.

LeVar dropped some serious knowledge ... saying what we're experiencing now was ALWAYS lying under the surface champing at the bit to be out in the open. And, now they are.

President Trump just did something you might never have expected him to do -- tweet in another language ... and that language happens to be aimed at the people of Iran.

DT took to Twitter Saturday with a message to the folks protesting in Tehran right now, decrying their government recently shooting down a Ukraine International Airlines plane by mistake ... and killing over 150 passengers, many of whom were Canadian citizens.

The Prez wrote, "به مردم شجاع و رنج کشیده ایران: من از ابتدای دوره ریاست جمهوریم با شما ایستاده‌ام و دولت من همچنان با شما خواهد ایستاد. ما اعتراضات شما را از نزدیک دنبال می کنیم. شجاعت شما الهام بخش است."

We know what you might be thinking if you're a native English speaker ... THE HELL DOES THAT MEAN?!? Not to worry, 'cause 45 sent out an accompanying translation. En ingles, it means ... "To the brave, long-suffering people of Iran: I've stood with you since the beginning of my Presidency, and my Administration will continue to stand with you." He adds, "We are following your protests closely, and are inspired by your courage."

He wasn't done with the Farsi ... Trump followed up by tweeting the above message, which translates, "The government of Iran must allow human rights groups to monitor and report facts from the ground on the ongoing protests by the Iranian people. There can not be another massacre of peaceful protesters, nor an internet shutdown. The world is watching."

Don't worry ... we Google Translated it ourselves, and it looks like Donnie got it right here.

If you haven't seen the protests on the ground in Tehran yet, they're pretty crazy -- with thousands taking to the streets and demanding the Supreme Leader Ayatollah Ali Khamenei resign after Iranian officials admitted they shot the Flight 752 in error ... mistaking it for a threat, this amid rising tensions between the U.S. and Iran after Soleimani's death.

Some folks were even reportedly chanting "Death to liars" during the demonstrations, in their own language of course.

Prince Harry's military buddy says the decision to bolt from the Royal fam was to protect his family ... and it's clear from listening to him  -- the death of Harry's mom loomed large in the decision.

JJ Chalmers appeared on UK's "The One Show" Friday and said Harry's #1 priority is his wife and kid.

It's interesting ... JJ thinks part of Harry's thinking was so little Archie would know when he gets older his pops did right by him.

Jane Fonda's star power knows no limits ... TONS of huge celebs, including Joaquin Phoenix, are risking arrest to help her protest in the Nation's capital.

Jane's call for fast action on a Green New Deal in Washington, D.C. has become a weekly Friday scene, and this week she's got Phoenix, Martin Sheen and Maggie Gyllenhaal, as well.

All protesters were just warned by cops that arrests are imminent if they don't cooperate and disperse. Friday's crowd is among the largest we've seen since Jane started the Fire Drill Friday protests. Joaquin, for his part, urged others to follow his steps and go vegan to help the environment.

This week, the environmental protesters are calling for an end to all new fossil fuel exploration/extraction and the immediate stop to taxpayer subsidies to oil companies.

Alexandria Ocasio-Cortez says what's happening in Australia shows the compounding effects of climate change ... and it has young people -- including her -- stressed about their future ... even giving them pause to have children of their own.

We got AOC on Capitol Hill Wednesday night and she touched on Australia's "horrifying" wildfires, telling us, it's just the latest example of climate change becoming an all-out crisis before our eyes.

The Congresswoman says we should all be working toward a remedy for the future, but obviously ... it's more important to younger people who will be living in this world longer. As she points out -- the stakes are higher the younger you are.

AOC adds people her age are anxious about having children due to looming threat of climate change ... and it shouldn't be like that. She says we have to take immediate steps to make the future safe for our kids.

The United States conflict with Iran has had Americans freaked the f**k out lately -- and, accordingly, they've been looking far and wide to burrow themselves underground.

TMZ spoke with some of the best bunker retailers in the biz, and wouldn't you know it ... they say their sales and window shoppers have gone through the roof over the past week or so as missiles and nuke threats have been flying back and forth in the Middle East.

Let's start with Rising S -- which hawks pretty pricey shelters, ranging from $45k to a whopping $1 million. They tell us bunkers have been selling like hotcakes since Trump took out Gen. Soleimani. RS says they've sold 17 bomb shelters since then. A recent uptick of 150%.

Sasha Obama decided against rushing a sorority at the University of Michigan ... despite being the it girl on campus.

We've called around Ann Arbor ... the first round of rushing began Tuesday, and multiple sorority members tell us Barack Obama's youngest daughter wants no part of it.

For those unfamiliar ... rushing is the process of exploring all of a university's sororities, and interested students at Michigan must register before a deadline. We're told Sasha did not register.

TMZ broke the story ... at the beginning of last semester, UM sororities were champing at the bit to recruit Sasha in the spring, and she was dubbed a "rush crush."

All signs were pointing to Sasha rushing and pledging Alpha Chi Omega (AXO) -- she stayed at AXO's house once before enrolling, and her close friends from high school are members there -- but now she's following her mother's and sister's footsteps by not rushing.

Michelle Obama didn't join a sorority at Princeton, and Malia isn't living the Greek life at Harvard, where sororities are not recognized by the Ivy League school.

Looks like Sasha is looking for a similar college experience.

Iran has already given a taste of its promised retaliation against the U.S. for killing one of its top military generals -- and it seems more and more threats are pouring in by the day.

For starters, a U.S. government website for the Federal Depository Library Program appeared to have been hacked Saturday by folks claiming to be working on behalf of Iran. They posted a photo-shopped pic of Trump getting punched by an Iranian fist, leaving him bloodied.

The hackers also left an ominous message on the page ... "Hacked By Iran Cyber Security Group HackerS ... This is only a small part of Iran's cyber ability! We're always ready."

Adam Carolla is so funny ... he can make a World War entertaining!!!

We got Adam leaving the Laugh Factory in WeHo early Sunday AM, and raised the looming prospect of a WWIII. The premise of the question -- that the U.S. would have to reinstitute the draft.

In case you've been living under a rock, Iran has promised retaliation after U.S. forces killed Iranian Major General Qasem Soleimani -- a brutal leader who has killed or maimed thousands of Americans in terrorist attacks around the world.

Adam says there's trouble ahead because today's culture is not conducive to service. Adam makes solid and possibly irrefutable points about the ailments young people will conjure up to get a deferment.