A hard sell? Companies struggle to promote green consumption

* Emissions from full product lifecycle under scrutiny

* Consumer responsible for much of carbon emissions

* Firms say take shorter showers, wash clothes less

* Sustainable consumer behaviours fall in many countries

* Progress on cold water detergents, LED lighting

By Emma Thomasson and Barbara Lewis

BERLIN/PARIS, Dec 7 (Reuters) - Eat misshapen veg, wash clothes in cold water, drive more slowly and recycle? It is perhaps no surprise that companies say persuading consumers to go green is a big challenge.

As negotiators seek a deal to reduce global emissions at the U.N. talks in Paris, companies are under increasing pressure to account for all their carbon emissions, from manufacturing all the way through to packaging and a product's disposal.

Businesses have been lining up to announce they will power their factories by renewable energy or source raw materials from sustainably managed forests and farms, but many say it is up to consumers too to change the way they use their products.

Years after detergents were developed to wash clothes in cold water, many people still turn up the dial. Electric car sales have been as sluggish as their perceived performance on the road, and tonnes of food and clothing still choke landfills.

Unilever, maker of Dove soap, estimates that customers are responsible for 70 percent of the greenhouse gas emissions associated with its products, compared to just 21 percent for the raw materials used to make them. The consumer goods giant has been promoting shorter showers - admittedly with limited success.

"It is far easier to get a consumer to switch their purchase behaviour from a less sustainable product to a more sustainable product than it is to influence how people use the products," said Sally Uren, head of Forum for the Future, a non-profit that works with business and government on sustainability issues.

Swedish-based fashion chain Hennes & Mauritz says the way clothes are cared for at home accounts for more than a quarter of the emissions during a garment's life. All H&M clothes now carry labels that recommend washing at lower temperatures.

Irit Tamir, senior advocacy adviser at campaign group Oxfam, however, says companies can't shift too much of the onus onto consumers. Businesses should focus on reducing their own emissions and those of their suppliers, while government should do more to encourage behaviours like recycling, she says.

"We need consumers to be engaged as well, but if we put too much of a focus on the consumer we are letting companies off the hook in terms of their own responsibility," she said.