Santi wrote:I have seen floods in Australia after some fires...
Australia is a very large country, in fact it officially qualifies as a continent.
In the north of the country it is currently their 
wet season with tropical areas receiving monsoonal rain.  Much flooding is occurring, in particular down the east coast.
Paradoxically much of Queensland is still very dry and is suffering from bushfires.
Ian lives in Queensland so he probably knows more.
Santi wrote:How many Australians died in the war against Japan helping the Americans.
Not sure of the exact details, but Australia declared war on Japan on about 9th Dec 1941 after the Japanese attacks on Thailand, Malaya, Hawaii, and the Philippines.
During the war Japanese bombs were dropped on Townsville in Queensland, on several small towns in the Northern Territory and Western Australia, and in a large scale bombing of Darwin, capital city of the Northern Territory. All in preparation for an invasion of Australia. 
That invasion never took place due to Allied forces, mainly from Australia, New Zealand and the United States defending the advance in battles in New Guinea and other Pacific Islands. I believe Australian casualties against Japan were around 27,000. 
It isn't for me to say we were helping the Americans or they were helping us. 
We became allies at the outbreak of WW2 because we were both under threat from the same country.
And yes. We all share the same planet and have an obligation to help each other when needed.