A power plant near Katowice, Poland, the host city for a major global climate conference that began on Sunday. It is the most important climate meeting since the 2015 Paris climate agreement was signed.

Czarek Sokolowski/AP

For the next two weeks, leaders from around the world are attending a major climate conference in Poland. They will talk about how to reduce global greenhouse gas emissions and how to support those communities that are already being affected by climate change.

It is the most important climate meeting since 195 countries, including the U.S., signed the landmark Paris Agreement in 2015 and promised to set specific emissions reduction targets. The U.S. said it would reduce greenhouse gas emissions by 26 to 28 percent by 2025.

Now the question is how, exactly…