The cities on the islands may not be huge cities with skyscrapers, but they are big enough to strain the ecosystem. The cities face constant resource and waste problems. While looking out at the city of Santa Cruz one night, I couldn’t help but think about how much travel can affect the environment. After all, how much of the city supports the over 200,000 tourists who visit the islands each year? How many less people would be there if the tourists were gone?