There's a lot on this thread about the sacrifices people have to make and how they won't be prepared to do it.
But tackling climate change is not necessarily about reducing living standards, and need not be horribly costly.
The economist Joseph Stiglitz suggests the costs would be relatively small - at most 2% of GDP - and more importantly, that spending the money to tackle climate change would actually create jobs and prosperity. There will lots of jobs in terms of creating forests, green energy projects, public transport infrastructure, etc etc.
By contrast the economic costs of not tackling climate change will be massive. (One small example - just think about the costs of the recent California wildfires - the massive destruction of property and insurance pay outs.)
What is important is that the costs of changing the economy are not all landed on certain groups, who will then oppose any attempts to tackle climate change - eg as is happening in France at the moment, as people who already feel they are struggling to get by oppose fuel taxes. There is an article in the Financial Times today about how carbon taxes have to be combined with pay outs to people/countries who do the most to reduce their carbon, and there are schemes designed for doing this.
As individuals, its not about living a deprived life either. Better public transport would massively improve life for many. Eating less meat will improve individual health for many Westerners. Creating and preserving green space is massively good for mental health and a sense of wellbeing, as well as being good for the planet. Many people in richer societies are getting fed up with "stuff" anyway and choosing to spend more on eating out, yoga classes, cleaners, personal trainers etc - there are all kinds of life-enhancing ways of spending money which are good for the local economy, good for employment and aren't high carbon.
Furthermore, as we invest in new technologies, things like air travel etc will likely become much less damaging, and there are prospects for low carbon artificial meats etc - but we need to make sure we can get to that point, and not trash the planet first.