NEW YORK - It is not every day that one gets to join two global powerhouses to promote a planetary breakthrough, but that is the reality with Connect to Learn: (www.connecttolearn.org), a new worldwide initiative to ensure that all children on the planet can attain at least a secondary education. The telecommunications giant Ericsson and the pop singer Madonna are teaming up to get kids into school and connected worldwide through wireless broadband. My colleagues and I at the Earth Institute and the Millennium Promise Alliance are joining the effort. The stakes could not be higher - or the prospects more exciting.