BERLIN (AP) — German Chancellor Angela Merkel says the world must do everything it can to meet an international goal to fight global warming, arguing that failing to do so could set off large new waves of refugees.

The U.N. and experts say governments' emissions-cutting pledges ahead of a global conference in Paris beginning this month aren't yet enough to hit the target of keeping the rise in global temperatures below 2 degrees Celsius (3.6 degrees Fahrenheit) by the end of this century compared with pre-industrial times.

Merkel said in a speech Tuesday "if we don't manage this, that could be a reason for many, many refugee movements" around the world.

Scientists say a temperature rise over 2 degrees Celsius could have profound, irreversible effects on the climate.