Three activities that humans do that affect ecosystems are: building , forests, and natural lands.

The indirect effects of human activities are change due to increased gases, loss due to destruction, and polluted environments due to increase runoff.

The name of the current geologic epoch is .

Atmosphere:
Humans the air with many different molecules. Increased levels of dioxide are the result of burning fuels and changes in use. The increased levels of oxide are due to the increased use of . The increased levels of are due to irrigated and raising of .

Biodiversity:
About species have become extinct in the past years. The pace of extinction has .

Cities:
Human population is currently over 7 . This results in demands for land, water, food, and energy.

Coastal Habitats:
These habitats have been to pollution due to runoff. The runoff carries & into water which feeds . High plankton results in of underwater organisms.

Farming:
Natural land is for agriculture. This results in levels of carbon in the atmosphere and a loss of .

Forests:
Forests have been for human development & agriculture. This changes of other species which may lead to their .

Invasive Species:
These species get introduced as a result of global and . They change the species that are already living in that environment. Since they are newly introduced, native species have no protection against them and can die due to the .

Mining:
Mining causes and pollution. They natural geochemical cycles of , , & .

Ocean:
Overfishing fish populations. Depletion of a population can not only harm species in the ecosystem.

Water Use:
There are changes occurring in and due to humans. The majority of water that flows back into them is used for agriculture, industrial, and municipal.