(a) Reducing deforestation, cutting down use of fossil fuel
(b) Reducing reforestation, increasing the use of fossil fuel
(c) Increasing deforestation, slowing down the growth of human population
(d) Increasing deforestation, reducing efficiency of energy usage
[NEET 2013]
Correct Option (a) Reason : Global warming can be controlled by reducing deforestation, cutting down use of fossil fuel, which results into reduction in the concentration of one of the greenhouse gas, i.e. Co₂ in the atmosphere. The other ways of reducing global warming are slowing down the growth of human population, improving efficiency of energy usage and encouraging eco-friendly sustainable development.