Per capita, Australia is one of the world's largest producers of carbon dioxide and other gases that many scientists believe are helping to warm the Earth's atmosphere, causing climate upset.
A long-standing drought and serious water shortages in Australia have focused much attention on climate change. Some experts warn higher temperatures could leave this nation of 20 million people at the mercy of more severe droughts and devastating tropical cyclones.
One present indicator of climate change in Australia is..
Result:
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Option 4: "drought."
Explanation: The text explicitly states that a long-standing drought in Australia has focused attention on climate change. This makes drought a clear present indicator of climate change, as it is a direct consequence of the changing climate conditions.
Option 1: "environmental activists."
Explanation: While environmental activists are mentioned in the text, they are not an indicator of climate change. They are advocates for change, but the text does not link them directly to observable climate change effects.
Option 2: "gas emissions."
Explanation: Gas emissions are discussed in the context of Australia's contribution to greenhouse gases, but they are not a direct indicator of climate change. The text focuses on the effects of emissions rather than presenting them as an observable indicator.
Option 3: "carbon dioxide."
Explanation: Carbon dioxide is mentioned as a gas contributing to climate change, but it is not an observable indicator itself. The text discusses its role in climate change rather than presenting it as a direct sign of climate change.
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