The BBC has put together a list of the most common arguments that “climate skeptics” use to refute the idea of global warming, along with a rebuttal for each.

Sceptic
Earth history shows climate has regularly responded to cyclical changes in the Sun’s energy output. Any warming we see can be attributed mainly to variations in the Sun’s magnetic field and solar wind.

Counter
Solar variations do affect climate, but they are not the only factor. As there has been no positive trend in any solar index since the 1960s (and possibly a small negative trend), solar forcing cannot be responsible for the recent temperature trends. The difference between the solar minimum and solar maximum over the 11-year solar cycle is 10 times smaller than the effect of greenhouse gases over the same interval.

It’s nice to be able to point to a resource when this kind of discussion comes up, rather than resorting to “Is too!”

Link