6.+Research

=Research= ===Landfill is a big hole that where all the rubbish goes. When the hole is full they use machines to cover it up with soil. Landfill make a lots of negative thing to the environment, because it causes pollution and it contain "Methane gas" and Methane gas is one of an "greenhouse gas".===

The other is it can be turn into electricity if the quality or quantity are good.
= = =The four 'R's=