Broadcast on 103.2 Dublin City FM, 27th Jan. 2011 IMAGE: Brown Trout, such as the one pictured here, are the subject of an new book by Irish fishery scientist, Martin O'Grady [Credit: Wikipedia] THE QUESTION IS Trees act as a brake on global warming, as they suck up 'greenhouse gases', but new pests are increasingly threatening trees in Ireland and around the world. We ask John Sweeney, climate researcher at NUI Maynooth, how serious is the threat to trees and what can be done about it? IN WRITER'S ROOM We speak to Martin O'Grady, author of 'Ireland's Brown Trout' WHAT'S IT ALL ABOUT? Invasive species are creating havoc in Ireland's rivers and lakes. We ask Joe Caffrey, of the Central Fishers Board, to explain what they are, and how they cause environmental damage. To contact the show, email: sciencespinning@dublinclityfm.ie