Each mission will look for signs of water, a requirement for life on Earth.

CNN: Mars Express leads interplanetary pack

Access to a clean and adequate supply of water is a basic requirement for human survival.

UNESCO: MEDIA SERVICES

In the plan, HIFRS said water used in fire fighting had been excluded because it was a basic requirement for service delivery.

BBC: Highlands and Islands brigade aims to cut CO2 emissions

Key recommendations in Defra's report include a legal requirement for vessels to use "pingers", a device which will emit a noise under water to warn dolphins off.

BBC: Dolphins plan dismissed