To get the audience understand the severeness of climate change and global warming, Hood also explained the thinning of the Arctic ice and its effect on the rise of sea levels, the Milankovitch theory that describes the collective effects of changes in the Earth's movements upon its climate and the greenhouse effect.
“Climate change, resource scarcity and the loss of ecosystem services are now seriously threatening to trash our economy because we simple cannot grow the economy forever on a finite planet,” he said.
He said nothing much is being done to save the planet because many people think they are to small to make a difference and such a task is just too big for them to handle.
“We suffer from cognitive dissonance whereby our brain is not hardwired to cope with such incredibly big problem, which is beyond our brain,” he said.
However, he said, it will make a difference when each individual starts playing a small part in changing the way they have been doing things.
“You may think that changing a light bulb will not make a difference but if six or seven billion people all change a light bulb, it will make a difference,” he encouraged the audience.
He said sustainability - the ability to maintain and improve the quality of life for all people, both now and into the future, whilst ensuring the continued availability of the natural resources and ecosystem services, is essential to supporting life on earth.
“Sustainability is important because our activities on the planet have destroyed forever 50% of the natural capital or ecosystem services, which took 3.8 billion years to create, in only the past 30 years,” he said.