What has made the environmental concerns as part of contemporary global politics ?

The reasons are :

(i) Existing agricultural land is losing fertility due to excessive use of fertilisers and pesticides.About 1.2 billion people in the developing countries have no access to drinking water and 2.6 billion have no access to sanitation.

(ii) Natural forests are being cut  down and people are being displaced.The loss of biodiversity continues due to the destructions of habitat in areas which are rich in species.