Whenever expansion or growth is mentioned by the politicians I've always had doubts about their policies - if a garden is of a certain size only a limited amount of produce will be possible sustaining a set amount of consumers. We are a plague unto ourselves and this DVD endorses just that and what a complex situation this is. Most naturalists are aware of change as species disappear or move and humans see a decline in their health whilst the climate makes acute changes sometimes causing devastation beyond imagination. One thing leads to another as for example the greenhouse gas effect causing the ice cap to melt - leading to more of the Earth warming up - resulting in more ice melting with resultent higher sea levels and extensive loss of land. There are some very clever and intriguing answers to some of the many problems. It is a quietly spoken lecture by many top experts with, of course, many impressive film shots. I nearly forgot to mention that Mikhail Gorbachev has a part in this amongst many other eminent experts including Stephen Hawking. Leonardo diCaprio has put this together very efficiently - let's hope something materializes in the near future!