The number of inhabitants on the planet ____ arriving at unsustainable levels as it confronts deficiency of assets like water, fuel and food.

Modern day agriculture practices ____ chemical products like pesticides and fertilizers to deal with local pests.

Land pollution can have huge environmental impact ____ the form of air pollution and soil pollution which in turn can have adverse effect on human health.

Waste from industrial and agricultural ____ pollutes the water that is used by humans, animals and plants.

The ozone layer is an invisible layer of protection around the planet that protects us ____ the sun's harmful rays.

Mark the letter A, B, C, or D to indicate the correct answer to each of the following sentences.

Burning yard waste releases mold spores, soot, and other contaminants that can aggravate allergies and cause ____ problems.

Deforestation simply means clearing of the green cover and making that land available ____ residential, industrial or commercial purpose.