P1 : five years ago P2 : fifty years ago P3 : fifteen years ago
P1 : five years ago
P2 : fifty years ago
P3 : fifteen years ago
P1 : oil spills off the coast of California P2 : endangered species in the jungles P3 : extinction of animal habitat
P1 : oil spills off the coast of California
P2 : endangered species in the jungles
P3 : extinction of animal habitat
P1 : could hardly see the birds flying on the hills P2 : that you hardly could see the city of Los Angeles P3 : could hardly see downtown from Hollywood hills
P1 : could hardly see the birds flying on the hills
P2 : that you hardly could see the city of Los Angeles
P3 : could hardly see downtown from Hollywood hills
P1 : reusing is crucial to our life P2 : recycling is part of daily life P3 : reducing should be present in our daily life
P1 : reusing is crucial to our life
P2 : recycling is part of daily life
P3 : reducing should be present in our daily life
P1 : endangered species P2 : air pollution P3 : soil pollution
P1 : endangered species
P2 : air pollution
P3 : soil pollution
P1 : we've made ravages to the climate P2 : the climate change is beneficial to the planet and creatures P3 : pollution doesn't cause climate change
P1 : we've made ravages to the climate
P2 : the climate change is beneficial to the planet and creatures
P3 : pollution doesn't cause climate change
P1 : chemistry and sewers P2 : chemicals and sewage P3 : fertilizers and sewage
P1 : chemistry and sewers
P2 : chemicals and sewage
P3 : fertilizers and sewage
P1 : better building practices P2 : reducing consumption by using things again and again P3 : renewable energy systems
P1 : better building practices
P2 : reducing consumption by using things again and again
P3 : renewable energy systems