The greenhouse effect is a warming of the earth's surface and lower atmosphere caused by substances which let the sun's energy through to the ground but impede the passage of energy from the earth back into space.

Currently, the most reliable method to estimate the age of tuna is by examination of their otoliths or "ear bones"

NIWA run a computer model which simulates wave heights across the Canterbury continental shelf and along the coast.

Plants and trees along the water margins and banks are called riparian vegetation.

Hydro-electricity is a renewable energy source that relies on the inflow of water into storage lakes upstream of a dam.

These datasets are available in a range of formats.

How do nutrients from wastewater treatment enter waterways?

Plots of UV levels throughout the day at different locations.