The author is writing a letter from the year 2070 looking back on the environmental destruction that has occurred. Water is now a scarce resource due to climate change and pollution. Trees and vegetation have disappeared, the ozone layer is depleted, and diseases have increased. The average life expectancy is now only 35 years old due to dehydration and health issues. The author feels guilty for belonging to the generation that failed to address warnings and hopes people will become more environmentally conscious to prevent this dire future.