Global warming
Global warming is a meme. The meme claims that there is a trend of increasing average temperatures on Earth. This climate change is theorized to include more floods, draughts, heat waves, and cold snaps, as well as extreme events like tornadoes and hurricanes. Global warming also causes melting of glaciers and the polar ice caps, which raises sea levels and floods low-lying areas. Of course, the high and low tide levels on Plymouth Rock haven't moved an inch in 400+ years, but the people pushing this don't let facts get in the way of pushing a good story to terrify the peasants into giving up all agency over their own lives.
Global warming can be caused by natural changes over time, as the earth's climate is never exactly the same year-to-year. It is also claimed by con artists falsely claiming to be scientists that human activities are causing global warming. This is thought to be through the burning of fossil fuels and release of carbon dioxide and other greenhouse gasses into the atmosphere.