Air travel is not the problem. In terms of transport, shipping cheap goods around the world's oceans and people holidaying on luxury liners is[i] properly environmentally damaging. The CO2 we as individuals introduce on our annual holiday is a tiny fraction. So let's keep things in perspective.
Well if you want to put it in perspective..
Imagine that you make one intercontinental trip per year by plane. How much energy does that cost?
A Boeing 747-400 with 240 000 litres of fuel carries 416 passengers about 8 800 miles (14 200 km). And fuel’s calorific value is 10 kWh per litre. (We learned that in Chapter 3.) So the energy cost of one full-distance round trip on such a plane, if divided equally among the passengers, is
2 × 240 000 litre/ 416 passengers× 10 kWh/litre ≈ 12 000 kWh per passenger
If you make one such trip per year, then your average energy consumption per day is
12 000 kWh /365 ≈ 33 kWh/day
14 200 km is a little further than London to Cape Town (10 000 km) and
London to Los Angeles (9000km), so I think we’ve slightly overestimated
the distance of a typical long-range intercontinental trip; but we’ve also overestimated the fullness of the plane, and the energy cost per person is more if the plane’s not full. Scaling down by 10 000 km/14 200 km to get an estimate for Cape Town, then up again by 100/80 to allow for the plane’s being 80% full, we arrive at 29 kWh per day. For ease of memorization, I’ll round this up to 30 kWh per day.
Let’s make clear what this means. Flying once per year has an energy
cost slightly bigger than leaving a 1 kW electric fire on, non-stop, 24 hours a day, all year.
Source: http://www.withouthotair.com/
Of course plenty more people fly short haul, but at least it gives a starting figure for energy consumption.