Even the best-case scenario involves major negative consequences in a few decades, with marginal additional emissions significantly increasing the risk of additional bad effects. The Paris 2015 agreement aims to reduce national emissions substantially by 2050 aiming for a rise (well below) 2 degrees. Temperature increases in excess of 5 degrees are quite possible if nothing is done. Cuts in emissions now will (statistically) save lives later even the most ambitious international plan to curb emissions will not prevent a significant and damaging rise in temperature. In particular if demand for aviation can be reduced now, that will make it easier for governments to make cuts later as well as reducing a significant source of high-altitude emissions today. Climate change is the "market failure on the greatest scale the world has ever seen" - market forces and personal action alone will not solve the problem. What is needed is swift and effective action at government and international levels. Emissions from international aviation are especially important as they are not covered by the COP21 Paris agreement, and could seriously undermine global efforts if not substantially reduced. The licence is not telling you what to do: that is up to you, but if you don't satisfy the licence you need to pay to use the program. If you break the licence you are certainly responsible for more emissions per person than are sustainable, and you can certainly afford to buy the Pro version. However, the licence is designed to be easy to understand, and sufficiently simple that people will know immediately whether they satisfy it. It is true that targeting flights is a very crude measure many people's CO 2 emissions come mostly from their home due to inefficient heating, insulation or air conditioning. Various people have questioned the WordWeb licensing terms.
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