There is a closing 20-year window in which decisions on climate and land use will determine the fate of dozens of native birds, butterflies and plants across Great Britain, which is already one of the most nature-depleted countries globally. That is the warning in a new study led by the UK Centre for Ecology & Hydrology (UKCEH), which, for the first time, predicts how different combined environmental changes would affect the survival of species within 1km square areas across the country.