WHEN the UN Climate Change Conference opens in Copenhagen next month, all eyes will be on the delegates' efforts to broker a deal that will prevent catastrophic global warming. Yet amid all the talk of caps, targets and trading, it is easy to forget who is ultimately responsible for the mess we find ourselves in. I have long argued that climate change begins at home. Each of us in the developed world has played our part in creating this problem and, while there is no doubt that coordinated global action is needed to tackle it, we can each be part of the solution.

So, ask yourself this: how green am I really? You might think you are doing your bit for the environment, but even if you shun bottled water, buy local produce and reuse your plastic bags, chances are that you have some habits that are far more environmentally damaging than you realise. What's more, if everyone else is doing these things too, their detrimental effects really add up.

1 Coffee

Take coffee. Its vendors are in the vanguard of those promoting more "sustainable" products, with organic and fair trade options now widely available. Starbucks even boasts a programme it calls Shared Planet^TM programme - the irony of that trademark appears to be lost on them - which has the declared aim of minimising the company's environmental impact and increasing involvement with local communities.

That's no bad thing, as far as it goes: fair trade can help to stop the exploitation of farmers, and buying organic may ensure more sustainable production techniques. But the average cup of black filter coffee is still responsible for 125 grams of CO₂ emissions. Of this, two-thirds comes from production and most of the rest from brewing.

Opting for the more prosaic joys of instant coffee reduces that figure to around 80 grams. Yet that still means a six-a-day caffeine habit clocks up more than 175 kilograms of CO₂ each year. That's the equivalent of a flight across Europe - from London to Rome, say. Add milk, and the methane belched by dairy cows means you increase your coffee's climate-changing emissions by more than a third.

It doesn't end there, though. The environmental group WWF has calculated that it takes 200 litres of water to produce the coffee, milk, sugar and cup for just one regular takeout latte. So if everyone ditched their pre-work coffee fix that would do wonders for the planet.

2 Toilet paper

Then there's toilet paper. Like coffee companies, loo paper manufacturers have long provided options for environmentally conscious consumers. Top of the list is 100 per cent recycled paper, which avoids much of the energy use and emissions associated with harvesting and processing new wood. Every kilogram of recycled tissue saves some 30 litres of water and between 3 and 4 kilowatt-hours of electricity. Since 1 kilowatt-hour of grid electricity is responsible for around 500 grams of CO₂, that means a saving of 1.5 to 2 tonnes of CO₂ per tonne of tissue.

Recycled toilet tissue is most widely used in Europe and Latin America, but even there it still only accounts for 1 in 5 rolls. In the US it remains very much a niche product. The average American gets through 23 toilet rolls each year, adding up to more than 7 billion rolls for the country in total. Of these, just 1 in 50 are from 100 per cent recycled fibres. As Greenpeace pointed out earlier this year, this not only wastes energy and water, it also puts additional logging pressure on old-growth forest in North America, forests which play a vital role in supporting native biodiversity.

The reason toilet roll made from new wood is preferred is quite simple: its long fibres produce the softest and fluffiest paper. Every time paper is recycled, the fibres become shorter, making for an increasingly rough bathroom experience. Recycled paper can't compete on softness so some use of new wood by the toilet paper industry may be inevitable. Sourcing Forest Stewardship Council (FSC) approved toilet tissue will help to ensure that any new wood fibres that are added to the mix have come from sustainable forestry projects that protect, rather than threaten, old-growth forest ecosystems.

3 Fast fashion

Next on my list of everyday decadence is fast fashion. In 1990, global textile production stood at 40 million tonnes. By 2005 that figure had risen to around 60 million tonnes. This surge in manufacture and consumption has been helped by fast-moving fashion trends and sweatshop price tags. As a result, much of the clothing we buy ends up being discarded long before it has worn out. In the UK, where the average item is worn for less than a third of its useful lifespan, more than a million tonnes of clothing are thrown away each year. The bulk of it ends up buried like woolly lasagne sheets in landfill sites or being used as multicoloured incinerator fodder.

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