How does acid rain affect life? The effects of smog on lakes and rivers

What is "biodiversity"? A measure of the health of the planet

>    Where are the world's threatened species?

>    How have humans affected the bays?

>    Why are coral reefs important?

>    Where have humans changed the land?

>    What causes mass extinctions?

>    What can we learn from Native Americans about protecting the land?

>    Where have humans protected the land?

Can man's impact be seen from space? The burning of the world's forests

>    Can we see parks from space?

>    Can we see national borders from space?

>    Can we see farms from space?

>    Can we see deltas from space?

>    Can we see fires from space?

>    How do humans use the land?

>    Can we see erosion from space?

>    Can we see deforestation from space?

>    Can we see irrigation from space?

>    Can we see ships from space?

>    Can we see railways from space?

What is the level of the ocean chlorophyll in June? Chlorophyll levels in the world's oceans during June

Where is the ocean chlorophyll in January? Chlorophyll levels in the world's oceans in January

How big were the fires around Sydney, Australia? Viewing Australian fires from space

How are cities studied from space? Satellites monitor urban landscapes

>    How is urban land use studied?

>    How do cities change over time?