Stay, leave, or scale back? Trump plans to announce his decision on the Paris Accord today

President Trump plans to bring weeks of indecision over climate change policy to a close this afternoon, announcing if he will withdraw the U.S. from the international agreement on climate change reached in Paris in 2015.

Here's what you need to know ahead of today's announcement:

The choice for Trump appears to be whether to quit the treaty entirely or stay with it but significantly scale back the U.S. commitment to combat global warming. 

The debate has split Trump's advisors for months. He has also been heavily lobbied by other leaders, from the pope to California Gov. Jerry Brown, who weighed in Wednesday in an interview.

U.S. diplomats have been making clear to their foreign counterparts that the Trump administration believes that economic growth at home is a higher priority than fighting climate change.

But a large number of business leaders believe that the climate change agreement is good for the economy. They and their allies in the Republican Party have been making that case to the White House.

Regardless of what Trump decides, California and other states with Democratic majorities have made clear that they intend to continue state policies to combat climate change. 

California leaders, in particular, have been taking the lead in building international support for efforts to convert to renewable energy and reduce use of coal and other fossil fuels.