The global warming folk are attempting to get polar bears declared an endangered species. By doing this, they hope to have judges place restrictions upon oil exploration in the Arctic, and perhaps even impose CO2 emissions quotas upon US industry and citizens.
They are pursuing this path toward their objectives because they lack the votes in Congress to pass their program by legislation. They hope a green thinking judge will bypass the elected Congress and impose their policies by judicial fiat.
This is profoundly undemocratic. Under democracy, new laws are passed only by the will of the majority. Right now, a majority for restricting oil exploration and imposing CO2 limits does not exist. In short, the greens don't have the votes to impose their will upon the country. So they try an end run around the Congress thru the courts.