Good news for fish; very bad news for people
More sea and less land is fine for penguins and for fish, but it's no good at all for people and other animals that live on the land. Some of the best land for growing food is also the most low-lying. That means it will be flooded first. It also happens that some of your biggest cities, like London, New Orleans and Bangkok, will get flooded too. Loads of people will go hungry and many more will have nowhere to live. This is very worrying.

Most of New Orleans is actually below sea level! And it did get badly flooded when hurricane Katrina hit in late August 2005.

The really sad thing is that it will be poor people who suffer most. I think that's very unfair because it's the people in rich countries who have been the cause of almost all global warming but it's the poor who drown or starve.

What do you think?
Then there's disease. As the world warms, nasty diseases like malaria are starting to spread because the changing climate favours the mosquito that carries the disease. Air travel is not just a cause of global warming but aids in spreading diseases very quickly just about anywhere. Someone with an illness like TB may easily pass on the disease to others during an airplane flight of a few hours. Insects like mosquitoes which can carry disease can even 'hitch a ride' on flights from one country to another.

About malaria
About 3.2 billion people – nearly half of the world's population – are at risk of malaria. In 2015, there were roughly 214 million malaria cases and an estimated 438,000 malaria deaths (World Heath Organization). Most of these are in the world's poorest countries. There are drugs for treating it but the malaria parasite (a tiny protozoan called Plasmodium) has become resistant to almost all of them. Poor people can't afford them anyway.

TB, short for 'tuberculosis' spreads when infected people cough and sneeze. In 2014, TB caused over 1 million deaths. It is a very serious disease because the TB bug is highly resistant to treatment.

In fact, if you were a disease bug looking for a human to infect, an airplane cabin would be the perfect place. Inside, the passengers are sealed into a metal tube for many hours with poor ventilation. Someone with a cold, flu or worse who coughs and sneezes will be (unintentionally) blasting bugs into the air. The bugs float around and get sucked in by other nearby passengers as they breathe. The bugs think it's great and that's why people so often 'pick up' something like a cold when they fly, packed in to the plane like sardines in a can. This is how diseases like SARS and MERS were spread. There were also some cases of Ebola which made it to North America and Europe during the terrible outbreak in West Africa in 2014. If and when Bird Flu gets going, flying is going to be what transmits it all around the world in just a few days. Scary, isn't it.