so
The crops used
Their use
Although energy is used in their production
A
since
From which export demand was going down
By 1980
Brasil grew
To
In 1975
Is
Such as
To achieve this
Biomass fuel
Due to
However
Are

Biomass and biofuels

Is used a lot in developing countries

Should be a renewable energy source

A big amount of people are consuming fuelwood resources faster than they are being replenished

Population pressure

According to WWF

Could provide 15 per cent of the electricity needed in developed countries (by 2020)

In contrast to the 1 per cent it contributes at present

2 per cent of the land area would be needed

From which crop, forest, and livestock products and their residues could be collected

Can be stored and used when needed

Fuels made from crops and mainly used for transports

Obtained from

Vegetable oils

(methyl esters)

Used in diesel engines

Fermented and distilled products of crops

Corn and sugar cane (ethanol)

Lower toxic exhaust emissions

Used in petrol engines

Brazil

Launched his National Alcohol Programme

Make ethyl alcohol from sugar cane

Massive amounts of sugar canes

There was spare capacity in its sugar mills

Production of petrol-only vehicles had stopped

New vehicles running on pure

Ethanol

Were created

Gasohol

Mixture of petrol and ethanol

How environmentally friendly are biofuels?

They are carbon neutral

Creates less greenhouses gas emissions than fossil fuels

Are produced by intensive agriculture

Lead to

Agriochemicals

Monoculture

This made air pollution to reduce in huge amounts

The cost of producing biofuels is too expensive

Not all farmers and governments trust on this fuels