expend (v)
/ɪkˈspend/

to use time, energy, money etc doing something

maintain (v)
/meɪnˈteɪn/

to continue to have; to keep in existence, or not allow to become less

outweigh (v)
/ˌaʊtˈweɪ/

to be greater or more important than something else

greenhouse gas (n)
/ˈɡriːn.haʊs ɡæs/

a gas that causes the greenhouse effect, especially carbon dioxide

renewable (a)
/rɪˈnjuː.ə.bl̩/

renewable energy and natural materials replace themselves by natural

energy (n)
/ˈen.ə.dʒi/

the ability to put effort and enthusiasm into an activity, work, etc

fuel (n)
/fjʊəl/

a substance that is used to provide heat or power, usually by being burned

island (n)
/ˈaɪ.lənd/

a piece of land completely surrounded by water

clean (v)
/kliːn/

to remove the dirt from something

friendly (a)
/ˈfrend.li/

behaving in a pleasant, kind way towards someone

light (n)
/laɪt/

a piece of equipment that produces light, such as a lamp or a bulb

microwave (n)
/ˈmaɪ.krə.weɪv/

an oven that cooks food very quickly by passing electricity through it, instead of using heat

coal (n)
/kəʊl/

a hard black substance that is dug from the ground and burned as fuel to provide heat

wind (n)
/wɪnd/

a current of air moving approximately horizontally, especially one strong enough to be felt

substance (n)
/ˈsʌb.stəns/

material with particular physical characteristics

tank (n)
/tæŋk/

a container that holds liquid or gas

nightmare (n)
/ˈnaɪt.meə(r)/

a very upsetting or frightening dream

chimney (n)
/ˈtʃɪm.ni/

a hollow structure that allows the smoke from a fire inside a building to escape to the air outside

fraction (n)
/ˈfræk.ʃən/

a division or part of a whole number, for example ½ or ¾

soybean (n)
/sɔɪbiːn/

a small bean grown originally in Asia, used as a food for people and animals