There are some things that, once lost, no amount of money can regain. Thus to justify the destruction of an ancient forest on the grounds that it will earn us substantial export income is problematic, even if we could invest that income and increase its value from year to year; for no matter how much we increase its value, its could never buy back the link with the past represented by the forest.
Peter Singer, Writings on an Ethical Life
conservation, environmentalism, ethics, moral-philosophy