politico.com

Over the last decade, Charles and David Koch have emerged into public view as billionaire philanthropists pushing a libertarian brand of political activism that presses a large footprint on energy and climate issues. They have created and supported non-profit organizations, think tanks and political groups that work to undermine climate science, environmental regulation and clean energy. They are also top donors to politicians, most of them Republicans, who support the oil industry and deny any human role in global warming.