verbs
adjectives
nouns
other
new
100
take the place of
REPLACE
100

new and original

INNOVATIVE

100

effect

IMPACT

100

(adverb) existing or happening throughout the world

WORLDWIDE

200

uses something up

CONSUMES

200

happening slowly over time

GRADUAL

200
coal, petroleum, and natural gas

FOSSIL FUELS

200

(phrasal verb) to reduce

CUT BACK ON

300

plan; to have in mind as something to be done or brought about

INTEND

300

created by human beings, not by nature

ARTIFICIAL

300
something that can be used instead of another thing

ALTERNATIVE

300

(preposition) farther than

BEYOND

400

to tell someone or something what they must do

COMMAND

400
useful or sensible

PRACTICAL

400

a chemical element that coal and diamonds are made of

CARBON

400

(adjective) relating to just one person or thing

INDIVIDUAL

500
tell someone to do something in a formal or official way

INSTRUCT

500

have the ability to

CAPABLE

500
conditions which affect what happens in a situation

CIRCUMSTANCES

500

(adjective) able to be trusted; dependable

RELIABLE

500
words that are frequently used together

COLLOCATIONS

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