Dutch national newspaper Trouw.nl have produced a number of Google Maps mashups. Visitors to the site can navigate news and reader's items for sale from one News Google Map and now Trouw have also produced a series of Google Maps to illustrate their coverage of the climate conference in Copenhagen.
The KlimaatKaart allows the user to read news articles about the conference and view a number of layers concerning the environment. The map also allows you to switch between the different layers.
This layer shows the temperature in 2100, this one shows the CO2 emissions per capita and this one wind energy production per country. The map also comes with a handy widget so you can embed the map in your own website.