Read the comments of some more callers to Hot Debate. Complete the sentences with theses expressions in the correct form. There are two extra words you should not use. Vocabulary The environment 11 carbon dioxide climate change cyclical drought reality waste wildfire flooding global warming greenhouse gas ice age environmentalist Linda: I totally agree with Terry and other (1) . People like Pete are a danger to society. He’s just closing his eyes to (2) because he doesn’t want to change his comfortable way of life. We all have to stop this (3) of natural resources and cut back on (4) emissions. Dave: Of course, Pete has a point in that weather events often follow a (5) pattern, but nevertheless the greenhouse effect is a scientific fact. (6) like carbon dioxide are reaching ever higher concentrations in the atmosphere. This stops heat escaping into space, and so we get (7) . Mildred: All my flowers died during the long (8) last summer, and friends of mine actually had to leave their home because of (9) that got very close to their village. When I was young, summers never used to be like this. It really looks as if (10) is happening right here. Imagine you are calling Hot Debate as well. What would you say? Write a short paragraph using expressions from 11. Writing 12 Transport Transport is a major contributor to greenhouse gas emissions all over the world. What alternatives to combustion engines for vehicles do you know? Do you think we can switch to green driving in the near future? Why (not)? Look at the title of the article. What do you think the author wants to tell us? Read the text to find out whether you were right. a Reading 13 b Is hydrogen technology hope or hype? Back in the early 2000s, supporters of hydrogen technology thought it would dominate the clean automobile market, but the promised “hydrogen highway” never happened, for a couple of reasons. Firstly, hydrogen power needed a new infrastructure, whereas battery cars could easily be charged from the electricity grid. Secondly, high-powered batteries at that time were already welldeveloped, while hydrogen was not. However, 20 years later, hydrogen is back for the sort of transport, industry and heating tasks that batteries cannot fulfil. On the one hand, a standard battery for a heavy vehicle would weigh up to five tonnes and take hours to refuel. Hydrogen, on the other hand, is lighter than air and it takes just minutes to fill a tank. Vehicles powered by hydrogen include diggers, taxis, trucks, boats, vans, buses, and small planes. It works by reacting hydrogen with oxygen in a fuel cell to generate electricity. The only direct emission is water. While this sounds great, it still leaves the issue of a charging infrastructure like hydrogen pumps on motorways. The same network could fuel hydrogen cars. Finally, heavy batteries in plug-in cars would be outdated. Language skills Extras Explore 7 Your environment 83 Nur zu Prüfzwecken – Eigentum des Verlags öbv
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