Bill Gates wants to block out the Sun in order to help with climate change.

Bill Gates wants to block out the Sun in order to help with climate change, by dispersing nano particles into the stratosphere.
How is this dim the Sun technology different from Chemtrails?
The process seems to be exactly the same as we are seeing in our skyes everyday, but no one questions what they see in the skyes. Most people think that those are from the commercial airlines.