https://www.theverge.com/2019/1/28/18201028/rep-ocasio-cortez-pingree-climate-change-facebook-google-microsoft-conference-sponsor

On Monday, Reps. Alexandria Ocasio-Cortez (D-NY) and Chellie Pingree (D-ME) asked the heads of Facebook, Google, and Microsoft to pledge their companies’ support for the science suggesting that climate change has made a significant, negative impact on the environment.

The lawmakers penned the letter after news broke last week that the companies sponsored a conference, LibertyCon, which promoted climate change denialism. At the libertarian-focused conference, a speaker from the CO2 Coalition gave a talk arguing that the environmental impact of climate change has been exaggerated.