Renewable technologies are considered as clean sources of energy
and optimal use of these resources minimize environmental
impacts, produce minimum secondary wastes and are sustainable
based on current and future economic and social societal needs.
Sun is the source of all energies. The primary forms of solar
energy are heat and light. Sunlight and heat are transformed and
absorbed by the environment in a multitude of ways. Some of
these transformations result in renewable energy flows such as
biomass and wind energy. Renewable energy technologies provide
an excellent opportunity for mitigation of greenhouse gas
emission and reducing global warming through substituting
conventional energy sources. In this article a review has been
done on scope of CO2 mitigation through solar cooker, water
heater, dryer, biofuel, improved cookstoves and by hydrogen.