desechos in English:

Though he is young, he never wastes time.

Better supervision is required. This place is nothing but confusion. For example, there is too much replication which only wastes time and energy.

It's shameful, the way he wastes money.

Industrial wastes pollute the earth.

The second is the affinity with environment. By utilizing natural energy and reducing wastes, we have to make houses which harmonize with ecology.