How do I know there is climate change? Well, for a starter, where I live (#NorCal) used to get hot weather maybe once a decade. For us, it isn’t really hot unless it tops out in the teens (>44 C). Now, we’re seeing hot truly hot weather every single year. Often we have spells above 120/50 degrees. That is how I judge climate change. That is what will bring the inevitable rise in sea level and flood my Sacramento Valley home.