In 2005, Milieuzorg Op School (MOS, Environmental Care at School) of the Department of Environment, Nature and Energy in Belgium organised the first Warm Sweater Day in response to the Kyoto Protocol.

The protocol’s objective was to reduce greenhouse gas emissions that cause climate change. Since 2005, Warm Sweater Day has reminded us of the agreements made under this crucial treaty with a few simple activities: wear a warm sweater and turn down the heat, take your bike more often, eat locally grown food, reduce standby power and so on. On Warm Sweater Day, Flanders massively reduced CO2 emissions as well as raising the awareness of school-going children, businesses and the authorities.

Participate in the 2017 edition of the Thick Jumper Day:

• Join the contest

• Download the materials and share the campaign