Boself wrote: "Let's tackle industry first": this means you are simply cutting branches instead of solving the problem by it's root.
The problem is not going to be easy to tackle. If we extend your tree metaphor a little further , no-one is realistically going to agree that the entire tree of industrialisation and modern living can be felled.
People have gained too much from modern conveniences to be willing to sacrifice all of them and return to living in a pre-industrial society. Any government that tried to tackle the problem at its root, would involve creating a pre-industrial society by closing all the factories, switching off the power plants and removing all the cars and airports, would lead to instant revolt and civil war. Millions of people would try to emigrate to the nearest industrialised country.
In fact, 'tackling the problem at its root' may involve attempting to change human nature itself, since many human societies show evidence of striving toward 'progress' and controlling the natural world.
So, if we have to reject this Utopian solution, we are only left with the possibilities of deading with the tree of industrialisation bud by bud, branch by branch. It's partly the job of educators to raise awareness about the environment among the public, partly the job of business to be responsible, partly the job of the government to set targets and taxes that wil promote sustainable development. International organisations will need to be involved too.
I am, as you say, in favour of increased air taxes, as well as drastic investment in the British public transport system. Unfortunately this will have the detrimental effect of making air travel less 'democratic', I have never denied that.
What I was indicating about the democracy of air travel was that the arguments about 'Aren't the budget airlines doing awful damage to the environment?' are often made by rich people who drive a SUV, travel abroad and have gained money from the capitalist/industrial sector. There is undoubtedly an element of snobbery in these condemnations, especially since Ryanair run a fairly environmentally-friendly fleet and Easyjet have been already been active in raising awareness about the environmental cost of flying.
The liberal elite are often well-intentioned, but they do have their own blind spots and bias, just like everybody else. Many of them are completely unaware that the high standard of living that they enjoy depends on the success of the capitalism and the complex economic systems of globalisation.
Sorry if I seem particularly harsh on this group of people, but to be honest I am sick of hearing people scream all about the need for 'activism' and protesting about Easyjet or Tony Blair or the oil industry before going back to their central-heated detached houses in Daddy's Mercedes. 'Activism' should begin at home, with simple things like cycling to work instead of driving, buying local produce rather than imports, and re-using the same plastic bag for your shopping. You're more likely to make a difference doing these simple things than campaigning for global change.
It is obvious that perhaps now the common and rich Western man can travel by plane. But the common African can't... you exclude Africans, Asians, etc, just like "the common man" in the West was excluded 50 years ago.
Again, it would be nice if there was world equality and people in developing countries enjoyeed the standard of living that we do in the West. This goal has proved elusive whether one adopts a capitalist, social democratic, Communist or anarchist approach to international development. Indeed, Marxist Angola seems to have fared rather worse than capitalist Botswana.
How can we create sustainable development in these countries, so that they might be able to enjoy so much of what we take for granted in the West? I admire those who propose a mass redistribution of wealth from the developed to the developing world, but I can't see how it can work in practice. A Western government that pledged, say 50% of their GDP to an African country, would quickly lose popularity with its public and again they will lose the election or else have to establish an unpopular autocratic regime, which will lead to Civil War.
Again, it has to be about a slow, steady approach to development and redistribution. Again, it will involve work of educators, governments, international organisations and NGO's. Personally, I can't see any way towards development that doesn't include the use of responsible capitalism, globalisation and the market, but maybe I've been brainwashed by my own evil Western system. Let me know if you have any ideas about how this might be done.