Letters to the Editor: Climate change deadline quickly approaching San Francisco Chronicle readers FacebookTwitterEmail In this March 9, 2010, file photo a tanker truck passes the Chevron oil refinery in Richmond, Calif. A federal appeals court ruled Tuesday, May 26 against major oil companies in lawsuits brought by California cities and counties seeking damages for the impact of climate change.Associated Press/Paul Sakuma As we make our way into the 2020s, a serious deadline follows us. By the year 2030, several of the impacts created by climate change will be irreversible. The UN’s Intergovernmental Panel on Climate Changes (IPCC) states that we need to cut our carbon emissions by half to avoid a climate disaster. Gov. Gavin Newsom’s deadline of 2045 for 100% clean energy will be much too late. As a California resident, the destructive consequences of severe wildfires became apparent in 2014, when I single-handedly watched a wildfire engulf the area around my school.