Good morning, NBC News readers.
It's Earth Day. This morning we're looking at President Joe Biden's ambitious climate pledge at the start of his summit with world leaders. And how the pandemic might have shown us a way forward — as well as the challenges ahead — in the push to curb emissions.
Here's what we're watching this Thursday morning.
Biden will commit to halving U.S. emissions by 2030 as part of Paris climate pact
The U.S. will aim to halve greenhouse gas emissions by 2030 as part of its renewed commitment to the Paris climate agreement, President Biden will announce Thursday.
Biden will make the pledge when he speaks at the start of the White House's virtual climate summit with world leaders, including Russian President Vladimir Putin and Chinese leader Xi Jinping, that starts this morning.
The summit is the Biden administration's first big step toward reasserting U.S. leadership on the climate issue and it will press the world's largest emitters, all of whom were invited to the summit, to make equally ambitious cuts.
It also comes at an interesting moment in time for the environmental movement: Global emissions and pollution plunged last year due to the coronavirus pandemic.
Yet, while heartening, the environmental reprieve isn't expected to last. There are already signs that as countries try to return to a new normal, economic activity — and all the emissions and pollution that go along with it — will creep up again.
And if the pandemic revealed that we are capable of cutting carbon emissions, it also highlighted the sheer scope of the problem.
Thursday's top stories

Most officers never fire their guns. But some kill multiple people — and are still on the job.
As cities grapple with high-profile killings by police and protesters fill the streets to demand justice, police reform advocates are beginning to ask: "How many people can a police officer kill before they’re held accountable?" By Tim Stelloh | Read more
What Derek Chauvin's conviction means for other former officers charged in George Floyd's killing
"It shows the strength of the prosecution's case against a jury of his peers," one lawyer said. "It's bad news for the other co-defendants." By Daniella Silva | Read more
China behind another hack as U.S. cybersecurity issues mount
Cybersecurity company Mandiant said a program that businesses often use to let workers remotely connect to their offices, had been compromised. The campaign is the third distinct and severe cyberespionage operation against the U.S. made public in recent months, stressing an already strained cybersecurity workforce. By Kevin Collier | Read more
OPINION: Castro is finally gone. Biden needs to act.
A new leader in Havana provides an opportunity for those advocating for major change — largely the nation's youth — to push for reform more forcefully. By Elena Sheppard | Read more
These states are trying to ban or curtail the use of 'vaccine passports'
The Biden administration has said it won't build a national vaccination app, but private companies are racing to create digital "passports" that show proof of immunization. Nevertheless, these states say they won't have it — even if it's unclear how some of the orders will be enforced. By Chloe Atkins | Read more
BETTER: Are you stress eating? How to spot and prevent this habit
If stress sends you straight to the bottom of a tub of ice cream, here are some tips to help you combat emotional eating. By Keri Glassman, R.D. | Read more
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Also in the news ...
- Video shows man rescuing child who fell onto tracks as train barrels toward station
- Covid vaccine appears safe for pregnant women, CDC report shows
- Virginia police officer fired after donating to Kyle Rittenhouse defense fund
- What's behind the renewed violence in Northern Ireland?
- The Foxconn plant, once touted by Trump as a 13,000-job juggernaut, will now create just 1,500 jobs
- They broke away to form a lucrative 'Super League.' After 48 hours of fury they're back.
SHOPPINGHow to reduce face mask pollution, according to experts.
One Spring thing
Every spring Idaho rancher Frank Shirts and his sheep dogs guide their flock across Highway 55 into the Boise foothills.
This year a record number of onlookers gathered to watch, many lining up on both sides of the highway, to see nearly 2,600 ewes and lambs make the crossing.
Watch video of the annual rite of passage here.
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Thanks, Petra