Maryland Sen. Chris Van Hollen joined other lawmakers and environmental organizations Thursday to introduce legislation that would hold the nation’s largest polluters financially responsible for the costs of the climate crisis. “The reason we’re all gathered here together is because we all agree on a simple but powerful principle, which is that polluters should pay to clean up the mess they have caused, and those who polluted the most should pay the most,” Van Hollen, a Democrat, said during a Capitol Hill press conference Thursday.