CNN: To celebrate Earth Day this year its organizers have returned to environmentalism’s roots. Jenny Quinton runs environmetal education tours in Hong Kong. Now in its 39th year, Earth Day 2009 will be marked on April 22 with the launch of the “Green Generation” campaign. It’s an ambitious two-year plan that Earth Day’s organizers hope will motivate people across the world to reverse environmental decline through a renewed focus on grassroots actions. The day itself will be …