The encyclical letter Laudato Si is available here on the Vatican website. Pope Francis devotes the final four paragraphs (13-16) of the introduction to a personal appeal. First, there is gratitude for those who work for the challenge of a better stewardship of the natural environment:
13. The urgent challenge to protect our common home includes a concern to bring the whole human family together to seek a sustainable and integral development, for we know that things can change. The Creator does not abandon us; he never forsakes his loving plan or repents of having created us. Humanity still has the ability to work together in building our common home. Here I want to recognize, encourage and thank all those striving in countless ways to guarantee the protection of the home which we share. Particular appreciation is owed to those who tirelessly seek to resolve the tragic effects of environmental degradation on the lives of the world’s poorest. Young people demand change. They wonder how anyone can claim to be building a better future without thinking of the environmental crisis and the sufferings of the excluded.
And he acknowledges that young people (and of course many people older) seek to have the suffering of people and the environment relieved. And doubtless, many people of all ages have labored long and hard in order that we might achieve some measure of fruitfulness on this issue.