they will double
Future they conjugation of double.

double

And they will double their energy use.
Et ils vont doubler leur consommation d'énergie.
Carbon dioxide emissions from aircraft have risen by 87% since 1990 and it is estimated that they will double by 2020.
Les émissions de dioxyde de carbone du trafic aérien ont augmenté de 87 % depuis 1990 et, d'après les estimations, elles devraient doubler d'ici 2020.
They are not economically viable and they will double or treble electricity prices for consumers while failing to cut CO2 emissions.
Elles ne sont pas économiquement viables et elles vont faire doubler ou tripler les prix de l'électricité pour les consommateurs, sans que soient réduites les émissions de CO2.
They will double the amount of money you can use, up to $100.
Ils vont doubler le montant d'argent que vous pouvez utiliser, jusqu'à 100 $.
They will double the amount of money you can use, up to $100.
Ils seront le double de la somme d'argent que vous pouvez utiliser, jusqu'à 100 $.
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