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Aircraft emissions show little sign of abating as the development of climate-friendly technologies struggles to keep pace with booming passenger numbers.
Vast technological opportunities exist for providing the world with clean energy in the future, but the real debate is over the policies needed to decarbonize the growing global economy.
The world may be largely indifferent to the presence of humanity, yet we have magnified our influence to global scales - above all, through the recent increase in atmospheric greenhouse gases.