Yes I'm concerned. Climate change aka Global Warming isn't just something that will happen in the future. It's happening now. Widespread drought, rising sea levels, ocean acidification, etc. These are the sort of things that were predicted decades ago. Whatever happens, damage is already done. Species are disappearing at a historic rate, and extinction if forever. Temperature is rising faster than any time in 10,000 years. Feedback processes have not prevented rising temperatures, and aren't likely to do so in the future. Wish I was wrong about all this, but all the evidence says otherwise.