Peter De Groot

Review: Variety is the spice of life

Review: Green grow the world's economists, oh

Review: Tropical tragedies

Review: Reefs of tyres and junk replace trawlers

Technology

Technology: A roof over your head for £100

Review: In search of a true measure of national wealth

Weaverbirds, the eighth plague / Review of 'Quelea quelea: Africa's Bird Pest' edited by Richard L. Briggers and Clive C. H. Elliot, Oxford University Press, pp 402, Pounds sterling 45

The ties that bind the Third World / Review of 'Exploited Earth - Britain's Aid and the Environment' by Teresa Hayter

Plantation policies for saving trees / Review of 'No Timber Without Trees: Sustainability in the Tropical Forest' by Duncan Poore, Peter Burgess, John Palmer, Simon Rietbergen and Timothy Synnott

Are we missing the grass for the trees?: Amazonian rainforest going up in smoke has become a powerful image of environmental destruction and the growing threat from the greenhouse effect. Tropical grasslands have been almost totally ignored

Plant power - fuel for the future: Plants are a benign source of energy. But lack of investment has hindered their development as a modern fuel. The threat to the global environment from fossil fuels could change all that

Music while you farm / Review of 'Farmer First' edited by Robert Chambers, Arnold Pacey and Lori Ann Thrupp