5.Taking into account the said aspects, we have no hesitation to hold that the writ of mandamus sought for in the writ petitions would not be the efficacious remedy, since petitioners are left with clear alternative and efficacious remedy as per the provisions of the National Green Tribunal Act, 2010, especially due to the fact that the subject issue was pending before the Tribunal from the year 2017, on which year also, the writ petitions were filed. That apart, section 2(c) of the Act, 2010 defines 'environment', to include water, air and land and the inter-relationship, which exists among and between water, air and land and human beings, other living creatures, plants, micro-organism and property. Likewise, injury is defined under Section 2(g) to be permanent, partial or total disablement or sickness resulting out of an accident and section 2(m) defines 'substantial question relating to environment' to include an instance where (i) there is a direct violation of a specific statutory environmental obligation by a person by which, -- (A) the community at large other than an individual or group of individuals is affected or likely to be affected by the environmental consequences; or (B) the gravity of damage to the environment or property is substantial; or (C) the damage to public health is broadly measurable; (ii) the environmental consequences relate to a specific activity or a point source of pollution.