Thanks for the replies, I like to just ask what others think sometimes. All these climate change announcements lately just got me thinking about what happens after if the desired effect is achieved. No one ever seems to talk about that. I quite understand why we don't want it to get any hotter but do we want it to get colder. I take into account there are many reasons why fish may have got bigger but, at least part of that may have had something to do with since warming began especially in the last 50 years or so. If green house gas levels are reduced to the same levels as circa 50 years ago are we going to get the same weather of 50 years ago IE winters of 63 and 47. And how is the flora and fauna going to cope with that after it has adjusted itself to present climate conditions. In the case of fish it must have some affect if bigger sizes has at least in part been due to longer hotter summers. If zero emissions is achieved is the world going to become extremely cold?
There doesn't seem to be any plan, talk, or any thought into how much green house gas should be reduced by and what it will lead to; the affect it will have on our lives, economies and flora and fauna.
The world's churning out increasing amounts of carbon dioxide and we will never be able to reduce atmospheric temperatures to those experienced fifty years ago. The most we can do is try and reduce outputs of carbon dioxide so that the earth warms up at a slower rate. This isn't easy to do - wind power and solar power are only used because they receive subsidies, which are paid for by the tax payer. Developing countries such as India and China will continue to burn huge quantities of coal to generate electricity. Their view is that the west used coal for energy after the industrial revolution and they are only doing what the west did in the past.
There is in fact lots of talk about the level by which greenhouse gases should be reduced. There was a meeting of many nations in Poland last week to discuss greenhouse gases and climate change.
Britain itself is committed to the Climate Change Act 2008 - see the summary from Wikipedia below.
"The Climate Change Act 2008 is an Act of the Parliament of the United Kingdom. The Act makes it the duty of the Secretary of State to ensure that the net UK carbon account for all six Kyoto greenhouse gases for the year 2050 is at least 80% lower than the 1990 baseline, toward avoiding dangerous climate change."
The idea of the act was that Britain would lead the world in reducing carbon emissions. But it's not happened. No other country has adopted such extreme targets -its too expensive. And Britain itself will have great difficulty in reaching the targets.
The effect of a warmer climate on UK fishing is that warm summers will enable more coarse fish fry to survive, and fish may grow larger because the summer lasts longer. The downside will be that rivers will be affected, as they were this summer, by droughts, low flow rates and excessive temperatures.
Trout fishing may be harmed by long hot summers as generally they prefer habitats with lower temperatures
