TORONTO - Catholics around the world are participating in a 40-day Lenten fast to pray for unity in the Catholic Church and among world leaders in addressing climate change.

WASHINGTON - The much-anticipated encyclical by Pope Francis on the environment, expected sometime this spring or early summer, is generating a lot of buzz in Washington and elsewhere.

ABOARD THE PAPAL FLIGHT FROM COLOMBO, Sri Lanka - Commenting on recent killings by Islamist terrorists at a Paris newspaper, Pope Francis condemned killing in the name of God, but said freedom of expression should be limited by respect for religion and that mockery of faith can be expected to provoke violence.

TORONTO - Having their views heard on a world stage has made students from a Toronto Catholic high school realize their voice on climate change does matter.

VATICAN CITY - Tackling the problem of climate change is a serious ethical and moral responsibility, Pope Francis told negotiators from around the world meeting for a climate summit in Lima, Peru.

MANILA, Philippines - Cardinal Luis Antonio Tagle told churches to pray for safety and forgiveness for not taking care of the environment ahead of a powerful typhoon approaching the Philippines.

As Environment Minister Peter Kent prepared to head to Doha, Qatar, to represent Canada at United Nations-sponsored climate talks, Canada’s Catholic bishops and the Canadian Council of Churches prodded him to do more to prevent a warmer, less livable planet.