5 TAKING CARE OF OUR PLANET

The air pag. 180

What pollutes every breath we take pag. 180

Water pag. 185

Heavy metals in the environment pag. 186

Soil microbiology pag. 186

Energy changes pag. 190

Nature helps us to clean air, soil, water and … do the laundry pag. 193

The use of microorganisms in bioremediation pag. 195

A gold mine in a water treatment plant pag. 198

Where most of our energy has come from so far pag. 202

Biological fuel generation pag. 202