because there weren't 6.6 billion people on every corners of the world back then.... and they didn't have machines.
it's somewhat misleading. the interpretation is misleading. Point a thermal gun at a house with family inside and it will light up. then point a thermal gun at the same house in daytime and nothing will show up because the house's empty as kids are at school and parents are at work. Point is - of course you will see "hot" area everywhere on Earth because there are people living in it but it doesn't mean they caused global warming 
men contributed to warming but men is not the primary cause of global warming. It's just something we do not understand yet.
well it's already a known historical fact that Earth has went thru Ice Age several times. Are we going thru it? no... not for another several hundred thousand years
no. not at all. Aerosol and chemical gas did not affect the climate. It affected our environment. Aerosol especially CFC were banned because it SUPPOSEDLY caused ozone hole.
