You can buy a one-way flight to Mallorca for anything from around CHF 50. This generates roughly 485 kg of CO2 emissions. Instead of flying to the most popular island in the Mediterranean, you could drive to Ticino, which would amount to just 85 kg CO2 each leg. (From Basel; myclimate CO2-calculator).
The choice is pretty straightforward isn’t it? Not always. The prices for different trips vary hugely. Switzerland is not a cheap destination. But if you factor climate costs into the price, the differences in price become less and less. So the only question that remains is ... Do I want to pay the true cost of my holidays or should I just lie in my hammock and leave it to the next generation to worry about?