Dr. John Ridge:  D'you know what I 've learned in the time I 've been with Doomwatch ? We 've got a generation in which to grow up . My generation ! Your generation ! During our lifetime , that 's if we get to three score year and _ ten _ . We 've got to get rid of warheads buzzing about up there round the clock and in submarines , also cruising round the clock . During our lifetime we 've got to control population , to control ionizing radiation . We 've got to cleanse the rivers and the seas , we 've got to unclog the air . And we 've got to have made a bloody good start by the time we 're dead or homo sapiens has had it : men perish from the Earth . We 've got to start washing underneath the arms and stop sweeping the muck underneath the carpet . We 've got to plant more trees than we cut down . We 've got to recycle the Earth 's resources , even our excrememnt and urine . We 've got to abolish the petrol engine or pay more for it . We 've got to pay more for everything . Our money or our life !