Vast swathes of land are used to graze meat animals and to produce feed for meat animals, it's fantastically inefficient. To make it worse, we pay tax that falsely reduces the price of that meat. As soon as we stop subsidising meat production land will be free for more cereal and vegetable crop AND more housing.
As for western consumerism, the tipping point for energy and mineral resouces is just about here for some areas. The result is that we are now, finally, looking at more efficient use and preservation of energy. But this needs to be two pronged, wind and solar might not be sufficient to power every xbox we want to leave running, so tax inefficient products. We've all got used to it with petrol and diesel, we've accepted that lightbulbs had to change, start chucking tax on phones with poor batteries.
We'll be fine if we are less selfish. Earth can be heaven or hell, collectively, we get to choose.