A large number of environmental websites tend to be Government or NGO based, as afterall they are the ones involved in passing the laws that require enforcement.
For example at Kyoto various agreements were made about reducing Carbon Dioxide emmissions. In the short-term this will mean a cost to business, with no real incentive to implement environmental measures. Obviously in the long-term, if there was to be a rise in sea-level due to global warming, then not doing anything would prove to be far more costly !
Having said that the sources of environmental information on the internet are many and varied, with often, the website pushing a particular agenda or emotive issue (whether it is logging ancient forests, killing whales or growing genetically modified food). Hence the 'surfer' has to be especially on the lookout for bias in the information that is available.