The data series per region are calculated as the average of the annual mean for lake monitoring stations in the region. Only complete series after inter/extrapolation are included (see indicator specification). There were no stations with complete series after inter/extrapolation in the South and Southeast regions. The number of lake monitoring stations included per geographical region is given in parentheses
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Around 10 million pairs of usable spectacles are discarded each year in Europe and North America. These can be used to help people in the developing world to afford glasses. Most opticians now act as collection points for old glasses, so drop yours off and give them a new lease on life.
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