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.

Consumption of fossil fuels at an alarming rate can ____ to global warming which can further result in melting of polar ice caps and increase in sea levels.

Recycling minimizes the need for raw materials ____ the rainforests can be preserved.

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

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

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.

Noise pollution is a common form of pollution that causes temporary disruption ____ there is excessive amount of unpleasant noise.

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

At present, timberlands cover 30% of the area, but wooded areas are being lost ____ a regular basis because people are looking for homes, food, and materials.

As the human population grows and grows, natural resources are being used at a rapid rate, and large areas of forest are being converted ____ human use.

Fossil fuel utilization brings about discharge of greenhouse gases, _______ causes environmental change.

By using the environment sustainably, the environment and the natural resources ____ provides will not be depleted or destroyed permanently - and will be available for human use for a very long time.

Preservationists believe that humans can have access to the land, but they should only utilize it for ____ natural beauty and inspiration.

Depletion of the crucial Ozone layer of the atmosphere is ____ to pollution caused by Chlorine and Bromide found in Chlorofloro carbons (CFC's).

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

To help save the environment, try ____ energy and water consumption, changing your eating and transportation habits to conserve natural resources, and adapting your home and yard to be more environmentally friendly.