Topical words:

Nature; Earth; wonder; planet; move; fresh; glacier; plants; animals; problem; environment; suffer; cause; realize; to be extinct; disappear; to be in danger; cruelty- free products; to test; to have nothing to do; population; alarm; energy; minerals; optimist; generation; a way out; technology; reserves; to waste; attitude; destroy; pollution; breath; poison; atmosphere; sewage systems; spray; insects; weeds; spoil; supply; to control; to recycle; to litter; to threaten; wild-life; greenhouse effect; exhaust; species; fertilizers; carbon dioxide; oxygen.