There's an organization called Nature Needs Half, their website explains how to increase Biodiversity and prevent humans from going extinct, we need to give the wildlife half of the Earth to re-wild and make the world sustainable again. However good the idea is, it's ignoring 3 big things: It's avoiding fixing what's causing the problem with a band-aid, it will dramatically change how we live our lives, and it doesn't have a concrete timeline.
Moving Humans to only utilize 50% of the Earth is a great idea, however it's ignoring all the real problems that are causing our planet to go bad. We need to make our factories produce less carbon, make our cars use renewable energy, and stop releasing greenhouse gases into our environment, but what this Half-Earth project gets us is an excuse to produce more carbon use fossil fuels and release more greenhouse gases. This will backfire on us if we don't do everything at once.
Humans right now are so used to being able to go wherever they want, travel far distances and occupy large areas of space. If we make 50% of it untouchable, however selfish it is, will make our human lives dramatically different. Preventing people from entering half of the earth will cause people to rebel, and won't get support of their citizens. It's already hard to make people agree with all the government choices, but taking their territory won't make anyone happy.
Nature Needs Half doesn't have a timeline to make things happen yet. To make people actually do something there needs to be a sense of urgency, but all they're trying to do is convince people that it's coming and say we should all help eventually. This doesn't help the Earth which is deteriorating in an accelerated rate and seems like a great idea just bad execution.
To fix what Nature Needs Half is doing, we need to stop everything making the planet worse and then set in place everything that will make it better. We are in a society where everyone is selfish and if you can make it relate to them you can make them listen.