from 1998 to 2007, exxonmobil gave millions of dollars to organizations that cast doubt on the scientific validity of climate change. >> it's obviously why they want climate change not to be true. as long as climate change is not true, then we can keep selling coal, natural gas, and oil. so remove the cause and your business is preserved. >> in 2008, exxonmobil announced they would discontinue contributions to groups that could, quote, divert attention in the important discussions on how the world will secure the energy required for economic growth in an environmentally responsible manner. in fact, exxonmobil is funding research devoted to mitigating the increase in greenhouse gases. yet there remain numerous deep-pocketed billionaires and corporations still supporting climate change denial. >> it's really disheartening, as a climate scientist to hear the