The so-called greenhouse effect is essentially the trapping of reflected solar energy (infra-red radiation) by ‘greenhouse gases’. We actually need greenhouse gases in our atmosphere, otherwise the average temperature on earth would be about -18°C and so too cold for life. Unfortunately, in the last 200 years or so, human activities like the burning of fossil fuels have pumped huge amounts of extra greenhouse gas into the atmosphere, enhancing the greenhouse effect and so warming up the planet. Continue reading
The choice of going to University is becoming an expensive option, with the new fee system leaving many young people seriously considering whether it’s worth the investment, exacerbated by a very shaky job market. There is one business sector that’s booming – the renewables arm of building services engineering (heating, plumbing, air conditioning, refrigeration and electrics) – with legally binding carbon reduction targets and government funding streams driving forward alternatives to fossil fuels for Britain’s homes and businesses.
Q: Is there any truth that temperature rose during the three day no fly policy after 9/11 and that vapour trails cause cooling?
A: Yes, in the day time at least. Because the skies were almost entirely free of contrails more energy from the sun was able to reach the earth’s surface, rather than being reflected back towards space by the contrails. This was used by some to argue that air travel actually helped to cool the planet through the reflection of sunlight by contrails. However, this overlooks what happened at night. With no contrails the infrared (heat) energy emitted from the earth’s surface is able to escape much more easily and so the surface is able to cool to a much greater degree. When there are contrails these act like strips of blanket – trapping the radiated heat and keeping the surface temperatures higher. So, when both day and night time temperatures are considered, contrails have a net warming effect on our planet, even before we consider the greenhouse gas emissions that they represent. An interesting recommendation made recently was to restrict night time air travel, and so confine the formation of contrails to the day time – where they have less of a positive climate-forcing effect. For more detailed information see this paper from the European Geophysical Union.
Given the scale of the problem that we face, it is all too easy to feel powerless. How, without running for political office, can we as individuals make any difference? Surely, cutting greenhouse emissions to the extent required is the job of our governments, industry and big business. The truth though, is that the real power to tackle climate change lies not with Prime Ministers, Presidents or Chief Executives. It is in the hands of the homeowners and the car drivers, the holidaymakers and the shoppers of the world, that the destiny of our planet’s climate truly rests. Continue reading
For many of us, our transport emissions are dominated by car-use. Your average 1.3 litre run-around will, in the space of a year, clock up somewhere between 4 and 6 tonnes of greenhouse gas. Drive a gas-guzzling 4-wheel drive though and your emissions can be more than double this. For decades, any advances made in engine efficiency have been undermined by demand for bigger, more powerful cars. Add to this the growth in the number of cars on the road – there are now more cars in the US than people to drive them – and it’s little wonder that cars have come to play such a leading role in human-induced climate change. Continue reading
In 1997, with ever-stronger evidence for an enhanced greenhouse effect driven by human activities, and deepening concern over the impacts the resulting changes in climate might have, over 150 nations came together in Kyoto in Japan to agree the first binding agreement aimed at cutting global greenhouse gas emissions: The Kyoto Protocol. But in 2009 the United Nations Climate Change conference in Copenhagen failed to agree on a binding agreement for all nations on reducing emissions. Continue reading
A warming planet causes sea-levels to rise for two main reasons. First of all there is increased melting of glaciers and ice sheets, whose melt waters continually add to the total volume of the oceans. Secondly, there is thermal expansion of the oceans: as the water warms up it takes up more space. Continue reading
WWF are asking the Green Choices community – What Wood You Choose?
WWF, the world’s leading conservation body, have just launched a study which has found that companies in the UK are selling items such as kitchen worktops, doors and decking that come from places where illegal logging is having a devastating effect on people and wildlife. Continue reading
An environmental and economic waste of money
Finding the most energy efficient electrical products is a good start for saving money and energy, but it doesn’t stop there. Most people believe that when they push or switch the POWER switch to the OFF position on an appliance that the appliance is completely switched off. For a majority of appliances this is NOT the case. Continue reading
I made a New Year’s resolution on January 1st 1994, to buy a field and start planting a native woodland. Unlike many resolutions, this one came true and has brought me a lot of hard work and happiness. I advertised for land, and nearly bought a field elsewhere, and then Julian and Emma Orbach asked me if I’d like to buy one of the fields on their newly acquired farm, Brithdir Mawr – the rest is history. Continue reading