Carbon emissions are known to be a major cause of global warming and climate change. The fact the global warming exists and that humans are speeding up global warming, doesn't mean we have to just sit back and accept the consequences. Measuring and reducing your emissions can reduce your impact on the environment and help reduce the effects of global warming.
Based on your energy consumption habits, you can measure your carbon footprint to assess your impact on the environment.
...but, knowing your individual impact is only the beginning.
Once you calculate your carbon footprint, you have to start reducing or eliminating your habits that have the largest impact.