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540 line

Indicates the 540 decametre line on the 1000-500 thickness chart. Often used as a rough guide to determine when an airmass is cold enough to produce snowfalls on the Australian southern alpine areas.

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Morrison skirts emissions question as Earth edges closer to 1.5 degrees

14:34 EST

While many countries used the American-led Earth Day summit to increase their targets for reducing greenhouse gas emissions – including US President Joe Biden, who pledged to cut greenhouse gas emissions in half by 2030 – Australian Prime Minister Scott Morrison avoided making any new targets for Australia.

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