A massive forest fire has been raging in Alberta, Canada, for nearly a month. Scientists say warmer, drier weather has increased the frequency and intensity of fires. For this month's Environmental Outlook: wildfires, climate change and threats to North America’s forests.
In a new book, retired British Royal Navy commander and amateur historian Gavin Menzies asserts that the Chinese discovered America 70 years before Columbus. Diane talks with him about his research and the controversy surrounding the publication of his book.
- Gavin Menzies author, retired British Royal Navy commander, and amateur historian
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