The tourism industry is booming, but as a consequence the airtravel industry as well. Every year, more and more people use an airplane to get to far away or even close-to-home destinations. Knowing that on average 55% of the CO2-emissions of your entire trip are derived from your flight, you might be interested in carbon offsetting. But what is it exactly, how does it work and what are the most trustworthy companies to offset your travels with?