The UN Charter for Ecological Justice will initiate a global aspiration to downsize the global economy until humanity once more subsists within the biocapacity of our planet. It is inspired by the insights from the I=PAT equation, the Jevons paradox and the data from the Global Footprint Network. The two page summary below is for the lay person; the online petition is available at this link and the preprint of the full scientific paper that launches this concept is available from SSRN: