With the 'de-printer' specially coated sheets of paper can be used 10 times over.
Together, these hidden "embedded" emissions create far more CO2 than all the world's planes, lorries, cars, trains and ships put together.
The heat sets off a chemical reaction that turns the iron into a precursor of steel. But this creates even more CO2 - in fact, the process makes more tonnes of CO2 than it makes steel. Demand is high for the world's first zero-carbon steel production - the steel makers are turning down new orders.industry produces 2.5 billion tonnes of CO2 a year. Cement is the main bonding ingredient for the concrete that forms the structures in our lives.
This smart design allows less material to be used by harnessing the different physical properties of the cement and steel in a way that's catching on fast. The engineers say this innovation cuts materials costs and halves the CO2 emissions that would have been seen in a more traditional construction.Of course, taking a decision not to build the controversial HS2 route in the first place would have saved many more emissions.
The United Nations has promised a treaty to restrict the making of plastic - but governments are lagging behind the speed of climate change.is the last of our five main emitters - though it produces significantly less CO2 than cement or steel.
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