英语单词七下第六单元重点

英语单词七下第六单元重点

1.Pollution:

1.1.Pollution(n):Thepresenceorintroductionintotheenvironmentofsubstancesorthingsthatareharmfulorpoisonoustohumans,animals,orplants.Example:Airpollutioniscausedbytheemissionofharmfulgasesfromvehiclesandfactories.

1.2.Pollutant(n):Asubstanceoragentthatcausespollution.Example:Carbonmonoxideisacommonairpollutantemittedbycarsandindustrialprocesses.

1.3.Contaminate(v):Tomakesomethingimpureorunsuitableforusebyaddingsomethingharmfulorundesirable.Example:Theriverwascontaminatedbyindustrialwaste,makingitunsafetoswimin.

1.4.Toxin(n):Apoisonoussubstancethatisproducedbylivingcellsororganismsandcancauseharmwhenintroducedintothebody.Example:Somehouseholdcleaningproductscontaintoxinsthatcanbeharmfulifingestedorinhaled.

2.ClimateChange:

2.1.Climatechange(n):Long-termchangeintheaverageweatherpatternsofanarea,includingchangesintemperature,windpatterns,andamountofrainfall.Example:Climatechangeiscausingrisingsealevelsandmorefrequentextremeweatherevents.

2.2.Globalwarming(n):AgradualincreaseintheEarth'soveralltemperature,primarilyduetothebuildupofgreenhousegasesintheatmosphere.Example:Theburningoffossilfuelsisamajorcontributortoglobalwarming.

2.3.Greenhouseeffect(n):ThetrappingofheatintheEarth'satmospherebycertaingases,suchascarbondioxideandmethane,whichpreventsitfromescapingintospace.Example:ThegreenhouseeffectisnecessarytosustainlifeonEarth,buthumanactivitiesarecausinganenhancedgreenhouseeffect,leadingtoglobalwarming.

2.4.Renewableenergy(n):Energythatisgeneratedfromnaturalresourcesthatcanbereplenished,suchaswind,solar,andhydroelectricpower.Example:Investinginrenewableenergysourcesiscrucialforreducingourrelianceonfossilfuelsandmitigatingclimatechange.

3.SustainableDevelopment:

3.1.Sustainabledevelopment(n):Economicdevelopmentthatmeetstheneedsofthepresentwithoutcompromisingtheabilityoffuturegenerationstomeettheirownneeds.Example:Manycountriesareimplementingsustainabledevelopmentpracticestominimizeenvironmentaldegradationwhilepromotingeconomicgrowth.

3.2.Conservation(n):Theactofprotectingandpreservingnaturalresourcesforfuturegenerations.Example:Nationalparksplayacrucialroleintheconservationofbiodiversity.

3.3.Recycling(n):Theprocessofconvertingwastematerialsintoreusablematerials.Example:Recyclingpaperhelpstosavetreesandreduceenergyconsumption.

3.4.Biodiversity(n):ThevarietyofplantandanimallifeinaparticularhabitatoronEarthasawhole.Example:Rainforestsareknownfortheirhighlevelsofbiodiversity,withnumerousuniquespeciesfoundnowhereelse.

4.NaturalResources:4.1.Naturalresources(n):Materialsorsubstancesthatoccurinnatureandarevaluableorusefultohumans.Example:Fossilfuelslikecoal,oil,andnaturalgasareexamplesofnaturalresourcesthathavepoweredhumancivilizationforcenturies.4.2.Deforestation(n):Theclearingorcuttingdownoftreesinaforest,usuallytomakespaceforagricultureorhumansettlement.Example:Deforestationcontributestoclimatechangeandlossofbiodiversity.4.3.Overfishing(n):Theactofcatchingtoomanyfishinaparticulararea,depletingthepopulationanddamagingthemarineecosystem.Example:Overfishingcanleadtothecollapseoffishstocksandharmthelivelihoodsoffishermen.4.4.Habitatdestruction(n):Theprocessofalteringordestroyinganaturalhabitat,makingitunsuitableforthespeciesthatlivethere.Example:Habitatdestructionduetourbanizationisamajorthreattomanyanimalandplantspecies.5.EnvironmentalProtection:5.1.Environmentalprotection(n):Thepracticeofsafeguardingthenaturalenvironmentandpreventingharmtoit.Example:Environmentalprotectionagenciesworktoenforceregulationsthatlimitpollutionandprotectnaturalresources.5.2.Environmentalconservation(n):Thepracticeofusingresourcesinawaythatpreservesthenaturalenvironmentforfuturegenerations.Example:Environmentalconservationeffortsincludereducingwaste,conservingwater,andpromotingsustainablefarmingpractices.5.3.Environmentalimpactassessment(n):Aprocessusedtoidentifyandevaluatethepotentialenvironmentaleffectsofaproposedprojectoractivity.Example:Anenvironmentalimpactassessmentisconductedbeforebuildinganewfactorytoensurethatitwillnothaveanegativeimpactonthesurroundingenvironment.5.4.Ecologicalfootprint(n):Ameasureoftheimpactofhumanactivitiesontheenvironment,calculatedas