Trace amounts of CO2 cause British summers to be horribly wet AND dry?

Boating Business: Rivers could dry up, claims EA

DROUGHT: A study by the Environment Agency (EA) concludes Britain's rivers could nearly run dry because of climate change, writes Harry Arnold. Researchers predict that wetter winters will not compensate for long hot summers that will cause reduced flow.

They estimate that by 2050 summer flows in the rivers Severn and Mersey are likely to be reduced by 80% and that of the River Thames is likely to be down to 50%.

The EA says the recent summer floods are an effect of climate change and that there will still be wet summers, but these and wetter winters will not make up for the overall lack of rain during hotter summers.

August '08: Butterflies at lowest level due to wet summer - Telegraph

Following a record-breaking wet summer last year which brought widespread flooding - August has again proved to be a massive disappointment with more rain falling in the first 17 days (95.5 mm) than the long-term average (84.6 mm) for the whole month.