Flying causes a significant proportion of carbon emissions, and because these are emitted at high altitude the effect on the environment is much more harmful. Do you really need to go ? If it is for a meeting, could you use the telephone or videoconference instead ? If it is for a holiday, why not try a Staycation instead ? We need to reduce the amount we fly. For UK and European destinations travel by train is a viable and enjoyable alternative.
Seat61 - a good resource for routes and price information for world-wide rail travel.