The problems we’re facing are tightly interconnected. The worry is that this gives us impossible trade-offs; we’ll be forced to prioritise one problem at the expense of another. But it isn’t the case; instead, these interdependencies mean we can solve a lot in one go. Move to renewable or nuclear energy to improve air pollution and climate change; eat less beef to improve climate, deforestation, land use, biodiversity and water pollution. Improve crop yields to benefit the climate and humans.