Hard Numbers: You’ll never guess what Finland did to reduce homelessness

15,000: Mexico deported around 15,000 migrants in April, up from 9,100 in March. Unfortunately for Mexico, it wasn't enough to stop President Trump from threatening to slap a 5% tariff on all Mexican imports as soon as Friday unless it halts the flow of (mostly) Central Americans to the US.

45: A whopping 45 percent of the mayors currently governing Japanese towns and villages were elected unopposed in the last electoral cycle, as shrinking populations, low salaries for politicians sap people's interest in running for office. #AllPoliticsIsLocal

35: Long-term homelessness in Finland has fallen 35 percent since 2008, making the Nordic country the only EU member state where that number has declined over the past decade. So, what's Finland's secret? Sit down for this one: turns out it's building houses for homeless people.

6: According to the IMF, six of the world's ten fastest-growing economies this year will be in Africa: Senegal, Ivory Coast, Ethiopia, Rwanda, South Sudan and Ghana.

When Donald Trump first started talking about buying Greenland last week, we figured it was a weird story with less legs than a Harp seal.

Signal readers, we were wrong. President Trump was so serious about purchasing the autonomous Danish territory that this week he abruptly cancelled a trip to Denmark after the country's prime minister, Mette Frederiksen, labelled the idea "absurd."

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The Amazon in flames – More than 70,000 forest fires are burning in Brazil right now, most of them in the Amazon. That's up 84% over the same period last year, and it's the highest number on record. This is the dry season when farmers burn certain amounts of forest legally to clear farmland. But critics say Brazilian president Jair Bolsonaro's efforts to loosen conservation rules have encouraged farmers, loggers, and miners to set more fires, many of them illegally. Bolsonaro – a science skeptic who recently fired the head of the agency that tracks deforestation – says, without proof, that NGOs are setting the fires to embarrass his government. Meanwhile, the EU is holding up a major trade deal with Brazil unless Bolsonaro commits to higher environmental protection standards, including those that affect the Amazon.

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Over the past fifty years, the Amazon rainforest has shrunk by an area equal to the size of Turkey. In the 1960s and 1970s, the Brazilian government supported settlement of the sparsely populated region for security reasons. Since then, huge swaths of the forest -- which is crucial for limiting the world's greenhouse gasses -- have been cleared for farmland used to feed Brazil's population and support its massive agricultural exports. Greater awareness of the environmental impacts in the 1990s produced tighter conservation regulations, though plenty of illegal clearing continues. In recent years, the annual deforestation rate has begun to rise again, and Brazil's new president Jair Bolsonaro has pledged to weaken regulations further in order to support businesses.

3: The US has recruited Australia to join its nascent mission of protecting ships in the critical Strait of Hormuz. Along with Britain and Bahrain, Australia is now the third country to join the US-led maritime mission, as high seas brinksmanship with the Iranians continues.

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