LE BOURGET, France — Despite a domestic agenda consumed by his response to last week’s terrorist attack in California, President Obama is closely tracking the United Nations climate change negotiations outside Paris, Secretary of State John Kerry said in an interview on Tuesday.

The president spoke by phone with Prime Minister Narendra Modi of India on Tuesday about an agreement under consideration here and conferred by phone this week with President Dilma Rousseff of Brazil, Mr. Kerry said.

India and Brazil, along with China and the United States, are among the world’s top producers of greenhouse gases that warm the planet. The role of the four nations in reaching a deal to curb those emissions is crucial to the success of the negotiations.