ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು ಪರಿಸರ ಸಮಸ್ಯೆ ಅಲ್ಲ?

Afforestation, planting trees on bare land, is a solution to environmental problems. Acid rain, loss of biodiversity and the risks of genetically modified food are environmental concerns.