The thawing of permafrost in many areas of the tundra biome as a result of global warming is of concern mainly because:

1.	it will decrease the abundance and diversity of soil-dwelling organisms in tundra habitats.
2.	the bacterial decomposition of the thawed organic materials will produce large quantities of CO2, increasing global warming.
3.	Oil and coal deposits will rise to the surface
4.	migration of the human population will occur towards the tropics.

The highest concentration of polycarbonated biphenyls [PCBs] in a lake is expected in:

The addition of fertilizers is frequently required in agricultural lands but not in wild mainly because:

What is most likely to occur due to continued global warming?

The environmental pollutants that will have the most negative effects would be:
1. human organic wastes
2. wastes from feedlots
3. an excess of natural nutrients
4. non-biodegradable chemicals

Kyoto protocol commits signatories to:
1. Plant more trees
2. Cut forests for agriculture
3. Increasing nitrogen oxides into the atmosphere
4. Increasing the amount of methane in the atmosphere

“Greenpeace” is a non-governmental environmental organization with headquarters in:
1. Geneva, Switzerland
2. Paris, France
3. Amsterdam, Netherlands
4. Nuuk, Greenland

Identify the incorrectly matched pair:

The radiatively active gas with the maximum percent increase in the atmosphere since 1750 AD is:

Non-biodegradable pollutants are created by:
1. Nature
2. Excessive use of resources
3. Humans
4. Natural disasters