In his first few weeks, President Trump has frozen climate spending, shaken up staffing at agencies like the E.P.A. and set off a wave of legal challenges.

Since the inauguration, billionaires who funded climate action over the last decade have avoided criticizing Trump’s climate policies.

The energy giant was vague on details, but analysts say the changes is likely to include less spending on renewable sources and a bigger investment in oil and natural gas production.

About 80 percent of manufacturing investments spurred by a Biden-era climate law have flowed to Republican districts. Efforts to stop federal payments are already causing pain.

To wean itself off Russian natural gas, Europe has found new sources of energy, including imports from the United States. But high costs are straining the economy.

The pause affects billions of dollars and is delaying home repairs, factory construction and other projects, many in states that voted Republican.

In announcing a $35 billion program to bring inexpensive solar power to some 300 million Africans, officials left out two words: climate change.

Executive orders and announcements by President Trump have put billions of dollars in U.S. climate commitments into question.

Some $35 billion is aimed at building small solar sites in rural areas and other improvements. The World Bank chief called the project “foundational to everything.”

Oil and gas executives welcomed President Trump’s early moves on energy policy, but many said they did not plan to increase production unless prices rose significantly.

The hydropower dam, in quake-prone Tibet, is set to be the world’s biggest. But China has said little about the project, which could affect nearby countries.

His executive orders ultimately seek to make the market for oil and gas as big as possible.

Many climate experts see its deserts as a place to build the green-energy future. For two local activists, the price is too great.

Most major economies are investing in ever-cheaper solar and wind power. The United States risks further ceding a global market to China.

C.E.O.s, policymakers and billionaires at the World Economic Forum’s conference have long pledged to fight climate change. Has it done any good?

Legal experts said the president was testing the boundaries of executive power with aggressive orders designed to stop the country from transitioning to renewable energy.

President Trump’s wave of executive orders yesterday sent an undeniable signal to the world about the United States’ role in fighting climate change.

The president said he’d declare an energy emergency, increase drilling and end support for electric cars. His pivot to oil and gas follows the hottest year in recorded history.

The United States will be one of only four countries outside the Paris Agreement, which is designed to reduce global greenhouse gas emissions.

With these two new monuments, Mr. Biden has protected more federal land and waters than any other president, about 674 million acres.