Bernie Sanders ripped into President Trump for skipping any mention of climate change in his State of the Union address Tuesday.

“In the year 2020, how can a president of the United States give a State of the Union speech and not mention climate change?” the Vermont senator said in remarks in New Hampshire directly following Trump’s speech.

“It is truly sad that we have a president of the United States who lacks the courage to stand up to his billionaire friends in the fossil fuel industry,” Sanders added, criticizing Trump for “dooming” future generations to “live in a planet increasingly unhealthy and uninhabitable.”

Trump, in his speech Tuesday night, didn’t mention climate change at all, but he did tout his recent announcement to join the Trillion Trees Initiative. That effort, launched at the World Economic Forum in Davos, encourages countries around the world to plant 1 trillion trees to absorb carbon dioxide to address climate change.

The president called the initiative “an ambitious effort to bring together government and the private sector to plant new trees in America and around the world.”

Nonetheless, Trump also touted U.S. fossil fuel production during his speech, calling the U.S. the No. 1 oil and gas producer in the world.

“With the tremendous progress we have made over the past three years, America is now energy independent, and energy jobs, like so many elements of our country, are at a record high,” Trump said. “We are doing numbers that no one would have thought possible just three years ago.”

Energy analysts, however, cautioned Trump was painting too rosy a picture.

“We cannot be lured into a false sense of energy independence by our resurgent oil production,” said Robbie Diamond, president and CEO of Securing America’s Future Energy.

“To reach true energy security, we must aggressively pursue fuel diversification so we are not hostage to only oil for transportation, deploy new vehicle technologies, and develop a domestic electric vehicle supply chain — from minerals to markets,” Diamond added in a statement.