Which Democrat has the best climate crisis plan? Compare their scores

Environmental groups rate Democrats' plans and records ahead of CNN's town hall focusing on the climate crisis

Democrats will pit their climate plans against each other on Wednesday at a seven-hour CNN town hall, as world scientists warn the window is narrowing to prevent catastrophe.

With the planet already about 1C (1.8F) warmer than before industrialization, the United Nations' climate panel says that keeping the increase to 1.5C would require "rapid, far-reaching and unprecedented changes in all aspects of society".