Melusine... the water fairy... do you still go to Avalon?

Why, yes I do! Avalon, CA, that is
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Well, CA is leading the way in trying to establish GHG emissions limits at the state level (google "AB 32"). We'll see whether these work or not. But that step seems to have motivated eleven (!) other states in the U.S. to also adopt the same limits. So, while it might be difficult to track emissions globally (and attribute them to various states/countries), the tracking can be done on a local level, and perhaps the local efforts will propagate to a wider scale. Here's hoping...!
States with Greenhouse Gas Emissions Targets
Let's be very honest about lifestyle changes. We'd have to cut out a lot including using computers, cars, buying new products etc
... Nope. Welcome to the human race to extinction 
If you think about ALL the things you're not doing right now, then affecting change becomes a really daunting task. One step at a time, every little bit helps, including carbon offset schemes. However, some have expressed the concern that people will buy carbon offsets and then use that to justify NOT making behavioral changes. Sort of like, "well, I exercised this morning so I can have an extra donut" rather than "I'll exercise and also avoid donuts". Unfortunately, I don't think the human race will die out (not in my lifetime at least), but do say goodbye to biodiversity... 