Leading the polluters
The ecological cost of air travel
Concrete worries
Cement kilns are the third largest contributors of carbon dioxide
Kyoto targets impossible
A problem with pollen
Global warming could worsen allergies, says a new study
Flying fines
Clean move
China cuts down its carbon dioxide emissions
Small is efficient
Low carbon emissions
Low carbon emissions
Risky venture
US environmental protection agency under fire
Ocean sours
At current rate seawater will turn acidic by century end
The dominant survives
Increasing nitrogen levels will pit plants against each other