PARIS (AP) — Tens of thousands of people have taken part in rallies around the world on Sunday, calling on leaders to halt climate change on the eve of a major conference in Paris. Because of a state of emergency in France imposed after the Nov. 13 Paris attacks, many of the rallies are taking place outside the country. [...] French police and activists clashed in Paris, with riot police firing tear gas to disperse protesters throwing projectiles. Thousands of demonstrators gathered in central Paris and formed a human chain along the route of a long-planned protest march that was banned by France's Socialist government in a security crackdown following the Paris attacks that killed 130 people. The gatherings were organized by the Alliance for the Climate and call on world leaders to reach a fair, ambitious and binding agreement to avoid the worst consequences of climate change and accelerate the transition toward renewable sources of energy by 2050.