This piece about Mayer Hillman leaves little doubt that the world with its dependence on fossil fuels is on an irreversible path of self-destruction. If the UK went zero-emissions tomorrow, it would make barely any difference. Individual acts such as re-useable coffee cups are drops in the ocean. My plan to let traffic filter at low speeds and low revs would make only a small local difference to the amount of carbon in the atmosphere (though it would bring a host of other benefits). Even adopting it worldwide would hardly dent the inevitable decline of the Earth’s biosphere. Depressing? Yes, but not to the point where we give up trying.