The problem is that people say 'but the world was in an ice age x number of years ago, and x number of years before that the ice melted. We, the UK, were under thick ice not that many years ago in the short time man has been on earth. The English Channel was created by the ice melting. The earth is always in a cycle'
That's all true. We will enter an ice age, ice will melt and, because it's natural, we won't be able to do anything about it. BUT it's the fact that cycle seems to be increasing. That's the problem. It the speed. The earth can cope with ice ages/melts but not if that cycle is sped up.
We can cut air transport, cars, use public transport, eat more plants, less meat etc., but we are holding off the inevitable if we keep on multiplying! I put this in another post recently. If you look at the year I was born (1963) there were about 3.5 billion people on this planet. I've not even retired yet and there are over 7.5 billion people. All needing water, all needing food (plant or otherwise), all needing homes, transport, education, clothing, entertainment - some are luckier than others in getting these things but the first three are needed by everyone.
It's not completely a case of cutting the use of fossil fuels, or not eating meat. It's getting to the stage where having a family of more than two children is looked upon like saying you smoke or you drink a bottle of wine a day - slightly frowned upon. Attenborough has said this - governments ignore it and people ignore it because people dream of their three children, four children family and because they can afford them, they have them.
But as my son likes to quote, the character Ian Malcolm in Jurassic Park said 'Just because you can, doesn't mean you should'. We all need to teach our children that, whilst it was fine to have 3 or 4 kids in our life time, it won't be in theirs. Or their children will be worrying about the same thing in 100 years time but there won't be anything to cut or increase to make the earth well again - because they (the children, the population of the day) will have put too much demand on this planet.