Northward March (image) The Earth Institute at Columbia University Share Print E-Mail Caption A new study projects the spread of the destructive southern pine beetle through much of the northern United States and southern Canada. Darker colors here represent infestations in successively later decades. Credit Lesk et al., Nature Climate Change, 2017 Usage Restrictions Credit must be given. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.