Thereisnodoubt1. theearthisbecomingwarmerbutthereisfiercedebateoverwhetheritishumanactivitythathascausedthisglobalwarmingorwhetheritisjustanaturalphenomenon.
ManyscientistslikeDrJaniceFosterbelievethatpeoplehavecausedtheincreaseintheearth'stemperature2. burningoffossilfuelslikecoalnaturalgasandoiltoproduceenergy3. byproductsarecalled"greenhouse"gasesthemostimportantone4. carbondioxide.Thesegasestrapheatfromthesunandthereforewarmtheearthwithoutwhichtheearth5. (be)aboutthirtythreedegreesCelsiuscoolerthanitis.Butincreasedamountofcarbondioxidemeansthat6. (much)heatenergyistrappedintheatmosphere7. (cause)theglobaltemperaturetogo8. .
On9. otherhandscientistslikeGeorgeHambleybelievethatanywarmingwillbemildwithfewbad10. (environment)consequencesandmorecarbondioxideisactuallyapositivething.