The correct options are
A The UNEP
B Global conferences to discuss climate change
C Using clean renewable energy
Climate change, global warming, pollution of land, air and water, ozone depletion, oil leakages, and deforestation are some of the environmental problems. To discuss immediate and long term environmental problems, and find solutions, a United Nations conference was held at Stockholm from 5th June to 16th June in 1972. The United Nations Environmental Programme was created for the sake of dealing with climate change and regulating countries' carbon footprint. Global conferences such as the Rio Earth Summit 1992, the global climate conference in Kyoto, Japan and the Paris conference in 2015 came up with resolutions to reduce greenhouse gas emissions, sustainable development and effort to curb global warming.