'Start Here': China-US trade truce, Girl Scouts visit a prison and all climate change is local. What you need to know to start your day.

It's Tuesday, Dec. 4, 2018. Thanks for choosing to start here.

1. US, China temporarily halt trade war

This weekend at the G-20 summit, President Donald Trump and Chinese President Xi Jinping appeared to reach a truce over the countries' long-simmering trade war.

The president called it one of the largest deals ever made, touting China's promise to buy a number of American goods that would boost agriculture.

However, ABC News' Karen Travers tells us the president may have gotten ahead of himself when he tweeted about auto tariffs on Monday morning.

2. Speculation around Democratic 2020 hopefuls

As dust from the midterms settles, Democrats are huddling with brain trusts to game out a potential bid for president.

Today, we are 700 days away from the 2020 election.

ABC News Political Director Rick Klein and FiveThirtyEight's Geoffrey Skelley examine who could break through against Trump in 2020.

3. Local communities lead climate change fight

This morning in Poland, world leaders are beginning their second day of a conference at which they're trying to figure out how to keep global temperature increases below the range described by the U.N. as "catastrophic."

The Trump administration, though, is rather divided on climate change.

Officials put out a report saying it's already having a negative impact on American life and economy, but the White House said that was far-fetched.

When we talked to one of the report's authors, he said the federal government is not treating this like an emergency, but many local communities already are.

Skip Stiles, executive director of the environmental nonprofit Wetlands Watch, tells us that officials in Norfolk, Virginia, need more help from the federal government to combat tomorrow's problems today.

4. Girl Scout troop meets with moms in prison

This is not your average troop meeting.

In Baltimore, a Girl Scout Troop meets every other week in prison because the girls' mothers are incarcerated.

ABC News' Rachel Scott spent some time with these women and girls, and she tell us how the program is aimed at helping both mothers and daughters.

Other news:

'My son was murdered by this officer and that was cowardice': The family of a 21-year-old black man mistaken for a suspect at an Alabama mall and shot to death by police was shot three times in the back, according to the results of an independent autopsy.

'Ideally, you would have a road map': Court filings due this week could shed more light on what high-profile witnesses are telling special counsel Robert Mueller and his team.

'A scenario like this raises all the classic warning signs of a foreign corrupt practices act violation': Trump associates considered giving a $50 million Moscow penthouse to Vladimir Putin, a source tells ABC News.

'I think it would have been good to have the full Senate': The CIA director is scheduled today to brief a group of senior senators on Jamal Khashoggi's murder.

'There's frustration': Mitch McConnell's handling of a bill on criminal justice reform prompts questions.

From our partners at FiveThirtyEight:

Why A Fringe Idea About The Supreme Court Is Taking Over The Left

Last 'Nightline':

Three years after Sandra Bland's death, questions remain: A new HBO documentary examines Bland's complex story, her family's desperate search for answers and reveals never-before-seen evidence in the case.

6:36

George H.W. Bush: An intimate look at the life of a president

"Nightline" takes a look at the tributes to the former president and the incredible relationships he had with his wife and family.

ABCNews.com

George H.W. Bush: An intimate look at the life of a president: "Nightline" looks at tributes to the former president and the incredible relationships he had with his wife and family.

3:25

This day in history: Dec. 4, 2014

Protests erupt after jury decides Eric Garner case.

ABCNews.com

Today in history:

Dec. 4, 2014 -- Protests erupt after a jury decides the fate of the Eric Garner case.

0:59

Soyuz rocket blasts off for International Space Station in high-stakes launch

Soyuz MS-11 rocket blasts off for the International Space Station from Kazakhstan's Baikonur Cosmodrome in high-stakes launch that follows October's aborted mission.

NASA

The must-see photo:

Former President George W. Bush watches as the flag-draped casket of his father, former President George H.W. Bush, is carried by a joint-services military honor guard to lie in state in the rotunda of the U.S. Capitol in Washington. (photo credit: Alex Brandon/Pool via AP)

For more great photos from around the world, click HERE.

Hot on social:

The Soyuz MS-11 rocket blasts off for the International Space Station from Kazakhstan's Baikonur Cosmodrome in a high-stakes launch that follows October's aborted mission.

All right, you're off and running. You can always get the latest news on ABCNews.com and on the ABC News app. Details on how to subscribe to the "Start Here" podcast are below. See you tomorrow.

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