Ahead of the United Nation’s Climate Summit, which begins in the U.K. this weekend, the Producers Guild of America and its PGA Green division are calling for Hollywood to clean up its energy footprint with an open letter released Thursday.

According to the group, productions emit an average of 391 to 3,370 metric tons of carbon dioxide, producing millions of metric tons of CO2 per year. As a result, PGA is setting a goal of reducing entertainment industry emissions by 50 percent by 2030.

The links below include “existing solutions that we can implement and work on now to start moving towards this goal.”