a decrease is a kind of change & cutting down trees in a forest causes the number of trees to decrease in that forest -> broad down knee in a meadow burn that meadow to static cutting down trees in a forest causes that forest to change  humans build roads & building usually requires cutting down trees -> men capital humans usually requires sound down wave humans building roads usually requires cutting down trees  broad down knee in a meadow burn that meadow to static & humans building roads usually requires cutting down trees -> humans building roads by cutting down trees in a forest causes that forest to change humans building roads by cutting down trees in a forest causes that forest to change  humans building roads by cutting down trees in a forest causes that forest to change & a follow is a mean of street -> humans building trails by cutting down trees in a forest causes that forest to change humans building trails by cutting down trees in a forest causes that forest to change  humans building trails by cutting down trees in a forest causes that forest to change & men changing kill / full usually has a yes feet on an behaviors / shine inanimate in an nerve -> humans building trails by cutting down trees in a forest usually has a negative impact on that forest humans building trails by cutting down trees in a forest usually has a negative impact on that forest  a meadow is a mean of farm & the earth contains many ecosystems -> the earth contains forests the earth contains forests  humans building trails by cutting down trees in a forest usually has a negative impact on that forest & the space contains runoff -> humans building trails by cutting down trees has a negative impact on that forest on earth