(Adds with pope arriving, large crowds, changes dateline)
By Philip Pullella
MAPUTO, Sept 4 (Reuters) - Pope Francis arrived to a vibrant welcome in to Mozambique on Wednesday to encourage the country's fragile peace, starting a three-nation African tour where climate change, poverty and corruption will also be high on the agenda.
The former Portuguese colony emerged from 15 years of civil war in 1992 but it was only last month that President Filipe Nyusi of the ruling Frelimo party and the leader of the Renamo opposition, Ossufo Momade, signed a permanent ceasefire.
Nyusi greeted the pope at Maputo airport, where the 82-year-old pontiff, arriving after a 10-hour flight from Rome, was treated to displays of dancing and singing.
Tens of thousands of cheering and singing people lined the streets of his motorcade into the city. The pope had no engagements for Wednesday night and was scheduled to hold talks with the president on Thursday morning.
Francis told reporters on the plane that he hoped the trip would bear "good fruit." With elections scheduled for October, some fear violence may break out again.
"He is coming at a time when we Mozambicans are trying to consolidate peace," said Manuela Muianga, a biologist and disaster relief manager in the capital, Maputo.
"We Catholics feel that he is a visionary man who can help Mozambique to strengthen hope and make us forget all those things that make us fight against each other. The biggest concern is the fighting between the two parties. I'm sure he will address this," she said.
Francis, who is expected to talk about peace when he meets Mozambique's leaders on Thursday, mentioned his concern in a video message to the country ahead of the seven-day trip, which will also take him to Madagascar and Mauritius.
"I think he is going to give a forceful message to the country's leaders about their responsibility to bring about peace and reconciliation, but also about addressing the root causes of the conflict," said Erica Dahl-Bredine, Mozambique country representative for Catholic Relief Services.
Climate change is expected to be a topic in Mozambique and Madagascar. Deforestation, along with soil erosion, made Mozambique more vulnerable when two cyclones hit the country this year.
Francis, making his second trip to sub-Saharan Africa, will not be able to visit the city of Beira because of the devastation.
According to the World Bank, Mozambique has lost 8 million hectares of forest, about the size of Portugal, since the 1970s.
Aides say the trip is a key opportunity for the pope to renew appeals enshrined in his 2015 encyclical "Laudato Si" on environmental protection.
Francis challenged governments on Sunday to take "drastic measures" to combat global warming and reduce the use of fossil fuels, saying the world was experiencing a climate emergency.
In Madagascar, the world's fourth-largest island, about 44% of forests have disappeared over the past 60 years, according to the French agricultural research centre CIRAD. The environmental danger there is aggravated because 80% of its plant and animal species are not found anywhere else.
Poverty and corruption will also loom large.
According to the U.N. World Food Programme (WFP), 80% of Mozambique's population of about 30 million cannot afford the minimum costs for an adequate diet.
The WFP says more than 90% of Madagascar's population of 26 million live on less than $2 a day and that chronic child malnutrition is widespread.
Francis has called for a fairer distribution of wealth between prosperous and developing countries, and defended the right of countries to control their mineral resources.
He has branded corruption "one of the most decimating plagues" in society.
Mozambique and Madagascar rank in the lowest quarter of Transparency International's Corruption Perceptions Index.
"Corruption is huge. Many Mozambicans have lost faith completely in their political leaders," said Dahl-Bredine.
Francis makes an eight-hour stop in Mauritius, a small island in the Indian Ocean that is relatively rich compared Madagascar and Mozambique.
But anti-poverty campaigners say Mauritius' tax treaties and financial services industry facilitate tax avoidance, draining desperately-needed revenues from poor countries. (Additional reporting by Siphiwe Sibeko in Maputo, editing by Ed Osmond)