I was about to have a list of best green sites arranged in order of popularity but guess what, some very comprehensive lists have already been compiled! Here they are, starting from the most recent list.

1) From TimesOnline Blog (Feb 27, 2008):

- The must-reads: GristMill, Treehugger, Digg/Environment, TheSietchBlog, Celsias

- The new blogs: Climate Debate Daily, Dot Earth, Hugg2.0, GuardianUnlimited – ClimateChange Blog, InBalance

- Policy, Economics and Energy: CommonTragedies, EnergyOutlook, TransitionCulture, OffGrid, EnviroWonk

- The scientists: RealClimate, Stoat, LogicalScience, ScepticalScience

- The macro activists: Greenpeace, GreenGirlsGlobal, DeSmogBlog, ThUnsuitablog

- The micro activists: GreenJellyBean, TheHedgeWizardsDiary, Alice in Blogland

- Green living: HippyShopper, HowCanIRecycleThis, TheGreenThingBlog, EcoStreet, TheCityFix, PlaneStupid, EcoWorrier

- The sceptics: WorldClimateReport, ClimateResistance, ClimateAudit, WilliamM.Briggs, VáclavKlaus

- Eco inventions: EcoGeek, EcoFriend

- Celebrity-earth love-ins: Ecorazzi, DHLoveLife

- The politicos: AlGore, JonathanPorritt, SianBerry

- The environment in art, pictures and essays: Nasa’s earth observatory, Nexus6, HoratioAlgeranon’s Anonymusing Tales, PlanetArk,TheEarthBlog

2) From Environmental Graffiti (Oct 21, 2007):

10 – EcoStreet
9 – Gristmill
8 – Environmental Graffiti
7 – The Oil Drum
6 – Green Options
5 – WorldChanging
4 – Real Climate
3 – EcoGeek
2 – Inhabitat
1 – Treehugger

3) From ReadWriteWeb (Oct 15, 2007):

Treehugger, EcoGeek, EnvironmentalLawProfBlog, New Scientist Environment Blog, AutoBlogGreen, Eco-Worrier, GristMill, Green Care Congress, Inhabitat, Ecomoto, The Lazy Environmentalist, AlternativeConsumer, TeensyGreen, Haute*Nature, HippyShopper, SustainableStyle, GreenOptions, NoImpactMan, GreatGreenBaby, EcoFriend, EcoFabulous, Ecorazzi, EcoStreet, Green As Thistle, TheGreenGuy, MindfulMomma, Got2BeGreen, TriplePundit, Celsias, Enviroblog, GetWithGreen, GreenThinkers, GreenWombat, LighterFootstep, LifeGoggles

4) From Mashable (Aug 14, 2007):

- Carbon Footprint Calculators & Carbon Offsets: Environmental Defense Paper Calculator, TheCarbonDiet, NativeEnergy, The Nature Conservancy Carbon Calculator, BeGreen, ZeroFootprint, Yahoo!GreenCarbonFootprint Calculator, Ecological Footprint Quiz, Terrapass

- Search engines: Sprig, The Nature Conservancy Nature Preserve Map, EcoSeek, Greener, GuideMeGreen, GreenMaven, Evolvist, HolisticLocal, SustainableTravel Internations, GreenBuildingBlocks, Lime, GoodSearch, GreenBuildingStudio, Yahoo!Green

- Games: ElectroCity, KyotoPotato, MyAbodo, WebEarthOnline

- Communities & user generated: OpenArchitectureNetwork, AlternativeE, GreenOptions, The Nature Conservancy Groupspace, Appropedia, NetSquared, GoodTree, Hooze, Sustainlane, Gusse, EarthLab Foundation, GreenVoice, Gigoit, MakeMeSustainable, Ecolocal, PlayGreen, YouthNoise, Loanables, Actics, Change, Hunuh

- Networking & Dating: Idealist, EarthWise Singles, VeggieDate, DharmaMatch, GreenDrinks, GishiGo, Pooln, Goloco

- Environmental Projects: Tree-Nation, StepItUp, 18Seconds, GoogleEarthOutreach

- Charitable Donations: InviteForGood, Alonovo, Kiva, ContributionManager, GiveMeaning, Giveness

- Blogs: WorldChanging, Treehugger, Earth2tech, Gombe Chimpanzee Blog

- Others: GreenPrint, GreenTV, LA GreenLiving, HotelChatterGreen Hotels Map, LocalCooling, Hunger Site, BBB Wise Giving Alliance, Wild Sanctuary, Greenpeace Esperanze Interactive Route Map, Scorecard

5) From LighterFootstep.com (June 05, 2007):

- Daily Fuel Economy Tip
- Eco Chick
- Ecorazzi
- GreenOptions
- Maria Energia
- No Impact Man
- The Sietch Blog