I believe Global climate change is real. But Global Warming isn't. While some places are warming, others are cooling. Which is what we see now with much of Europe & America with freezing temperatures & the Arctic regions warming and melting.
That is an expensive trip any way you slice it, but check out Lan chile's website for tips and they might have some deals. You are going during high season and many places will be booked, so be sure to get hotel rooms or some type of accomodations before you travel.
Not something you'll hear about in the mainstream media, which is obsessed with snow in Washington D.C. (winter snow has more to do with precipitation than temperature, by the way), but it's nevertheless true.