We also need to do everything we can to obtain domestic energy.

Most portable chargers can obtain energy from the sun only.

It is possible for an ecosystem to obtain energy without sunlight.

In order to obtain energy they eat plants or other heterotrophs.

This concept is almost identical to how both plants and many animals obtain energy.

Brazil and China are two countries leading the field of obtaining energy from biomass.

They may have to drink four to five times their body mass of liquid during the day to obtain enough energy.

Our economies were based on another method of obtaining energy.

Countries must have the right to choose the technology they use to obtain energy.

They interact with their world, obtaining food and energy from the environment, but also changing it in some very large ways.