For last 15 years industrial emissions thus have fallen almost by half.

Since 1989 the emission of pollutants has in fact fallen, but only because the economy has collapsed.

Lead emissions from British vehicles fell by more than half between 1975 and 1988.

Global emissions of carbon dioxide fell by 1.3% in 2009.

At the same time emissions of greenhouse gases have fallen by 4 percent.

For example, emissions in Germany would fall by 4%.

Since 1990, these emissions have fallen by around 14%.

Our economy will become weaker, and emissions will not fall, but rise.

Despite the increase in energy use, the emission from these two chemicals has fallen dramatically.

Unfortunately we need to see emissions fall dramatically, especially in a relatively high-polluting industry like air travel.