A--------- rain is one of the consequences of air pollution. It occurs when emissions from factories, cars or heating boilers contact with the water in the atmosphere.

The ozone l---------- is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation.

S--------------- energy is energy that we will never use up or deplete. It is inexhaustible, like , for example, the kind we get from wind, sun or water.

A h-------------- car is one that uses more than one means of propulsion - that means combining a petrol or diesel engine with an electric motor.

Don´t leave the water r--------------- when you´re doing the dishes.

It´s vital to use r--------------- energies like the solar one because they pollute less than the traditional sources of energy.

F------------ are strong, unpleasant, and sometimes dangerous gas or smoke like , for example, the ones released by cars.

S------------ is air pollution that reduces visibility. It is a mixture of "smoke" and "fog".

Cutting down trees without restrictions brings about d-------------------

It´s important to r----------------- glass, plastic and paper in the right containers.

A f---------- fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms

Eolic energy is generated by wind t-------------

C----------- ch------------ is the most evident effect of global warming: temperatures aare becoming more extreme all over the world.