The only thing we are unsure about is how long it will take for the Earth system to display those atmospheric changes as climate change phenomena.

BBC: Harrabin's Notes: Debating the IPCC

While hundreds of studies around the world have linked climate change to phenomena including the increased frequency and intensity of hurricanes and other storms, changing rainfall patterns, drought, coastal flooding, changing disease patterns and the migration of human populations.

CNN: Environmentalists hope UN talks tough on climate change

Through 13 interactive lessons, young people will be encouraged to gain a better understanding of the scientific phenomena underlying climate change and their effects on the environment and to evaluate the human contribution to this phenomenon.

UNESCO: CULTURE

On paper, the commission's aim is straightforward: to respond to citizens' concerns about big, trans-national phenomena such as climate change, migration or globalisation, and convince them that action at the European level is the answer.

ECONOMIST: Charlemagne

McCain also released a television ad Monday in Oregon that connects climate change to increased destructive weather phenomena like hurricanes.

CNN: McCain: Clean energy a 'national security issue'

Droughts, floods and other water-related phenomena are among the clearest signs of climate change.

CNN: Sponsors

The most formidable challenge that the Convention will have to face over the coming years are related to global phenomena such as population explosion, diminishing financial resources and climate change.

UNESCO: MEDIA SERVICES

Some of these phenomena are not new but are aggravated by cumulative pressures such as climate change, intensified human activity and technological advances.

UNESCO: OFFICE IN BRASILIA