Perhaps its most ambitious attempt so far to get consumers to make the kind of small change that can have a big impact on the environment is when P&G asked people in France, Italy and the UK to 'turn down to 30'.
Using Ariel or Dash at lower temperatures can make a significant difference to the amount of energy used up in laundry, without any compromise in cleaning results or convenience.
In fact, if the whole of the UK population reduced their washing temperature by one click on the machine dial, the annual energy saved would be more than 2 Terawatt hours of electricity.
In getting consumers to turn to 30, P&G tried to demonstrate the savings in terms people could relate to - powering 1,000 villages in the UK or lighting some of Italy's most impressive piazzas, for example.
P&G does not yet have national statistics to fully measure the success of these initiatives. But it is known that in P&G's UK field tests, after trying Ariel for 2 weeks, more than 80 per cent of participants said they would consider washing at 30 degrees.
P&G also ran tests in France and Italy via independent institutes which placed energy monitors on hundreds of consumers' machines, then gave the consumers Ariel or Dash and asked them to wash at lower temperatures, without forcing them to.
In these two tests, both countries' average wash temperatures went down and energy was saved by a measurable amount.
P&G has also had success in saving fresh water, through a campaign called 'Every Drop Counts' in Spain www.cadagotacuenta.com (Spanish language), a country particularly affected by water shortages.
The campaign had a simple premise: add two extra items to your average wash and thus cut down the overall number of washes - and amount of water - used a year.
Approximately 55,000 consumers signed up to it, helping to save around five million litres a year in the country, as well as making Spaniards much more aware of the need for water conservation.