“Our maturity is evidenced by our beginning to take responsibility for our planet on a global scale, albeit in a very tentative, barely discernible way. We are beginning to realize what we are doing to our environment… We are beginning to see that we cannot go on despoiling the planet, polluting the air, rivers and oceans.”

The Value of Science (1955)
Context: We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.
... It is our responsibility to leave the people of the future a free hand. In the impetuous youth of humanity, we can make grave errors that can stunt our growth for a long time. This we will do if we say we have the answers now, so young and ignorant as we are. If we suppress all discussion, all criticism, proclaiming "This is the answer, my friends; man is saved!" we will doom humanity for a long time to the chains of authority, confined to the limits of our present imagination. It has been done so many times before.
... It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.

Source: The Turning Point (1982), Ch. 1. The Turning of the Tide.

The Last Page, p. 7.
A History of Reading (1996)

Source: The World We Have: A Buddhist Approach to Peace and Ecology

Columbus Day Speech, San Francisco (1992)