SUBJECT AREAS:PORTFOLIO AND CONTROLLED WRITTEN ESAMINATION

human population density is a factor en every envioromental problem

plummeting
across much of the so-called Third World.

POLLUTION
It is a very pressing green issue. There is air pollution and a layer of smog hanging over big cities. There is also water pollution. In many parts of the world the quality of the water is bad becouse rivers had been polluted by all shorts of industrial waste, by chemicals and fertilisers.

ENERGY
Another extremly important green issue.
The way we use energy is causing harm to the envioronment. Power station-..electricity
we need make sure that we use energy in a sustainable way.

GLOBAL WARMING AND THE GREENHOUSE EFFECT
The greates threat today is a combination of global warming and the greenhouse effect.

Average global temperature has increased by almost 1 over the past century. Scientists expect it to increase and aditional 2 or 6 ºC over the next hundred years. This could change the Earth's climate as never before

ECOSYSTEMS
Many ecosystems depends on a delicate balance of rainfall, soil type and temperature.
A rapid change in climate could upset this balance and seriously endenger many living things.

HOW TO STOP GLOBAL WARMING
REUSABLE PRODUCTS INSTEAD OF DISPOSABLES

USE LESS HEAT AND AIR CONDITIONING
heat and cool your home
weather stipping or caulking around doors