Preventive steps for global warming : 
Growing trees in vacant places.
Growing social forests and protect them.
Promoting abundant growth of phytoplankton plant species in marine water. They reduce carbon dioxide in the atmosphere.
Taking steps to reduce CFCs that destroy the ozone layer.
Restraining industries and motor vehicles that emit greenhouse gasses such as CO₂ and NO into the atmosphere.
Fitting catalytic converters to vehicles to separate nitric oxide into nitrogen and water.
Propagating the use of vermi-compost and organic manures instead of chemical fertilizers in agriculture.
Farmers are to be convinced that they need to shift to the use of neem, garlic and chilli based pesticides instead of chemical pesticides.