Strategies To Halt Or Reverse Acidification Effects

Question 0

The liming of lakes:

Treating an acid lake with

Answer 0

Powdered limestone can quickly increase the pH of the water.

Question 1

The two main strategies to halt or reverse the effects of acidification are

Answer 1

The liming of lakes

Reduction of sulfur dioxide emissions

Question 2

The liming of lakes:

Liming is very

Answer 2

Expensive and needs to be repeated regularly to maintain the pH improvement.

Question 3

The liming of lakes:

It is difficult to judge the

Answer 3

Amount of lime needed to restore the lake to its pre-acidification acidity level.

Question 4

The liming of lakes:

pH recovery is

Answer 4

Rapid, but sensitive biota may be affected.

Question 5

The liming of lakes:

Liming is therefore a very drastic solution and may

Answer 5

Only be justifiable in unusual circumstances, such as the preservation of a threatened species.

Question 6

Reduction of SO2 emissions:

Answer 6

Would reduce acid deposition.

Question 7

Reduction of SO2 emissions:

Air pollution generated in one country can

Answer 7

Lead to deposition in another country; therefore international agreements are needed to reduce levels of acid deposition in certain regions.

Question 8

European protocols:

The United Nations Economic Commission for Europe (UNECE) has

Answer 8

Agreed to several protocols for the control of emissions.

Question 9

European protocols:

1. The 1988 Sofia protocol

Answer 9

Concerning the control of emissions of nitrogen oxides.

Question 10

European protocols:

2. The 1994 Oslo protocol on

Answer 10

Further reductions of sulfur.

Question 11

European protocols:

The 1999 Gothenburg protocol on

Answer 11

The ending of acidification, eutrophication and ground-level ozone.