The Medway Handyman wrote:
If climate chamge is man made, [...]

For the vast majority of earth's history, climate change has been
entirely due to natural factors: solar flux, orbital variations,
biological processes locking up carbon, volcanic events, etc.

Now, human activity can affect the climate too: e.g. a nice
nuclear war (i.e. n. winter) should do the trick, although burning
fossils and releasing carbon as CO2 works as well -- if a little more
slowly, and in the oppsite direction.

Simples.

#Paul