ecological adj, the ecological effects of industry, the pollution of the atmosphere, the pollution of rivers,etc.
reduce---reducible減量用 adj,--- Rubbish can be reduced to 1.5 lbs by paying the price $0.50 per reducible plastic bag by ks Wang by HKGovt.
reuse---reused重複利用盡用 adj;---Wang is quite used to dumping hard on food-trash, but not reused for cooking again.
recycle---recycled 循環再造adj.---Treat Wang to recycle newspapers by de-inking, pulping to be recycled.
replace--replaceable代替品 adj; that can be replaced-eg:-Get a replaceable while Wang is away on govt holiday.