The New York Times and the Washington Post cover the environment to a certain extent, but it’s behind a pay wall.
Some of the best environmental coverage I’m seeing is in the Guardian and The Hill, both of which are free, although the Guardian does ask for contributions.
Here’s a link to the Green Light, the Guardian’s environmental newsletter. You can sign up for it here, at the top of the page:
Here’s link to today’s “Overnight Energy.” There’s a signup for the free newsletter at the bottom.