Desertification is the trigger, and climate change and population explosions are the amplifiers. The result is a widening collapse of small-scale farming, the foundation of societies all over Africa. And that collapse is leading to a rising tide of “economic migrants, interethnic conflicts and extremism,” Monique Barbut, who heads the United Nations Convention to Combat Desertification and guided me in Niger, explained.”

“A few numbers: Niger, with rampant poverty and poor access to contraception, has one the highest birthrates in the world: 7.6 children per woman. I met a man there who boasted of 17 kids. Neighboring Nigeria is growing so fast it will replace the U.S. as the third-most-populous country in the world by 2050. Nigeria is a third bigger than Texas.”

“Meanwhile, climate change in the region is so severe that nearby Senegal’s national weather bureau says that from 1950 to 2015, the average temperature there rose two degrees Celsius and the average annual rainfall declined by about two inches. The Paris climate accord was designed to keep global average temperatures from rising two degrees Celsius above preindustrial levels by 2100.”

“In other words, parts of sub-Saharan Africa are already at heat levels that Paris was supposed to prevent by the end of the century — and the region is heading for a four-degree rise, which will lead to the collapse of even more small farms and lead to a mad scramble of refugees toward Europe, competition for food and more unemployed males ready to join ISIS for $50 a month.”

“Barbut, as I reported, reinforced her point by showing me three maps of Africa with dots concentrated in the middle of the continent. Map No. 1: the most vulnerable regions of desertification in 2008. Map No. 2: conflicts and food riots in 2007 and 2008. Map No. 3: terrorist attacks in 2012. All the dots of all three maps cluster around Niger and its neighbors. Hello?”

“And what is Trump’s response to this reality? It’s to focus solely on using the U.S. military to kill terrorists in Africa while offering a budget that eliminates U.S. support for global contraception programs; appointing climate-change deniers to all key environmental posts; pushing coal over clean energy; and curbing U.S. government climate research.”

“In short, he’s sending soldiers to fight a problem that is clearly being exacerbated by climate and population trends, while eliminating all our tools to mitigate these trends.”

“But this is not only in Africa: Trump was obsessed with defeating ISIS in Syria and Iraq — but with as few U.S. troops as possible. The only way he could do that was by tacitly allying with Iran, Syria’s regime, Russia, pro-Iranian Shiite militias, and pro-U.S. Kurds, who were the main anti-ISIS forces on the ground. We could not defeat ISIS or stabilize Syria and Iraq without all of them.”

“And what is Trump’s strategy now? I have no clue. We’ve distanced ourselves from the Kurds, moved to tear up the nuclear deal with Iran and added U.S. troops in Afghanistan, a country we also can’t stabilize without the tacit help of Iran next door. If you know how these dots connect, please write.”

“Also: How do we stabilize our border with Mexico and maintain our neighbor’s cooperation in holding back the main source of illegal immigration today — refugees from Central America — while pursuing trade policies that have weakened the Mexican peso and the Mexican economy and could lead that country to elect its own anti-American populist-nationalist?”

“Nothing Trump ever says has a second paragraph. His whole shtick is just a first paragraph: Build a wall, tear up the Iran deal, tear up TPP, defeat ISIS, send troops to Niger and Afghanistan to kill terrorists, kill climate policy, kill family planning, cut taxes, raise military spending. Every box just marks an applause line he needed somewhere to get elected. Nothing connects — and we will pay for that.”

“Indeed, if you want to know what it looks like when a country follows a leader with no second paragraph and no ability to connect dots, visit London. I was there last week. Britain’s political system is in turmoil and its economy is facing declining growth prospects, because a bare majority voted to follow leaders with no second paragraph — we’ll just quit the European Union and everything will be fine.”