science has shown that Evolution is an observed fact, and Natural Selection is its best explanation.
You are correct, but I would say that natural selection is the most plausible theory that science can support at this time. Science changes, it's never a fact.
Global Warming is also an observed fact, and its consequences can no longer be ignored (I guess you believe that the cold winter in a selected part of North America means that Global Warming is not true? When in fact it's a predicted consequence of Climate Change).
We are having an impact on the earth, consuming fossil fuels at a rate that far exceeds their creation is bound to have consequences. However, I'm of the opinion that the earth will far outlive humans - regardless of whether or not we get off this rock. I personally enjoy the comforts of modern technology - and would like to see our resources spent on finding a way to colonize the stars. Extending our stay here for a few extra thousand years isn't going to do anything in the grand scheme of things.
Gay marriage a matter of human rights, just like mixed-race marriages were 40 years ago.
Nope nope nope. Marriage isn't a right - and is only wrapped up in politics because certain benefits are bestowed upon those who sign a contract stating they will be together for life. This would be such a non-issue if those benefits were no longer tied to marriage but to a binding contract that grants one person of your choosing those benefits. At what point do you say that denying marriage among multiple adults is an abuse of human rights, or what about brothers and sisters? How about your children or grand children? If we're going to throw out the whole foundation of morals based on religious beliefs - let's at least commit 100%.
you claim there's no difference between a foetus and a child
I walk up to a pregnant woman, stab her in the gut, kill the 'foetus'. I should only be charged with assault (or possibly attempted murder). Right?
The difficult we do today; the impossible takes a little longer.