climate change Research & information: general 80 Technology: general issues 32 sustainability 31 drought 30 History of engineering & technology 27 sustainable development 24 remote sensing 20 China 19 Biology, life sciences 18 biodiversity 18 machine learning 18 water quality 18 precipitation 17 temperature 17 Science: general issues 16 agriculture 15 renewable energy 15 adaptation 14 energy efficiency 14 conservation 13 governance 13 groundwater 12 numerical simulation 12 GIS 11 climate 11 environment 11 modeling 11 uncertainty 11 Environmental science, engineering & technology 10