You don't have to do very much except sit around and wait. Those very big 8.6 earthquakes around the western Pacific will entertain you with a great big volcano sometime soon. They have little volcanoes under water right now. THAT is what blocks the sun. Not my F-250 SD 4WD. I only have a 3" tailpipe. Volcanoes have a tailpipe between 5-10 miles across and their smoke goes straight up to over 50,000 feet.
If you can get a bag of volcanic ash, mix it in the soil with the smallest plant you want to see get big. My dad did with a 4" aloe tree. It's very big now. Like 30 feet! I want to see what a breadfruit tree does.
I like volcanic eruptions in the summer, because then we escape from much of the 100-115 degree weather. Ash in the upper atmosphere makes a nice sunshade.
Don’t like them in the winter, as then the crops freeze.