Bjorn Lomborg: Global priorities bigger than climate change

TED 2005
Bjorn Lomborg: Global priorities bigger than climate change (script)
Summary
In the world, there are a lot of problems that there are people starving, dying of HIV and AID, without clean drinking water, and without sanitation. There are people who will be severely affected by climate change also.
The speaker suggests us to prioritize the big problems in the world. It means that people decide what should be the top priorities and the bottom priorities of the solutions that they have to the world's biggest issues. It's because we don't actually solve all problems. It won't be good that spending a lot of money doing a little good. Money of the world has a limit. If we use the money to protect some diseases, it's 10 times more than treating it.
Then he made many people who have a different work write the top and the bottom priorities  list.
The surprising answer was figured out. Even while Americans and other people said that the malnutrition and diseases are solved at the top and climate change at the bottom. He summarized that let's do not the things that we can do very little at a very high cost and we don't know how to do, but let's do the great things that we can do an enormous amount of better at very low cost, right now.
However, I don't think that. It's because until now we seek only benefit to do something that everybody wants to do at first. Its outcome is the present. Developing countries force responsibility onto developed countries. Developed countries force all things that developing countries can't do onto them. So this is the time for all countriesto to cooperate. The money have to be used for the protection that the speaker said. Before our earth becomes heavy ill which called climate change, we have to protect it.
Words in this story
prioritize /verb/ designate or treat (something) as more important than other things.
priority /noun/ a thing that is regarded as more important than another.
substantial /  considerable, real, significant, important
pessimistic /  gloomy, negative