Speaking with reporters as Hurricane Irma barreled up Florida's Gulf Coast on Sunday, Pope Francis bolstered his reputation as an outspoken advocate of addressing man-made global warming when he said aboard the papal plane that "history will judge" climate change deniers.
"If someone is doubtful that this is true, they should ask scientists. Then each person can decide and history will judge the decisions."
"You can see the effects of climate change, and scientists have clearly said what path we have to follow," he said, acknowledging scientists' suggestions that people across the world alter their activity, particularly by reducing their use of fossil fuels, in response to global warming.
"All of us have a responsibility, all of us, small or large, a moral responsibility. We have to take it seriously. We can't joke about it," he continued. "Each person has their own. Even politicians have their own."
"If someone is doubtful that this is true, they should ask scientists," the pope added, responding to questions about climate denialism. "These are not opinions made on the fly. They are very clear. Then each person can decide and history will judge the decisions."
The Independent characterized Pope Francis' comments as a "thinly veiled attack" on U.S. President Donald Trump, whom the pope has previously criticized for his promises to erect a wall along the Mexican border and his decision to withdraw from the Paris Climate Agreement.
The pope is known for speaking out in favor of climate action—most famously when he released a 2015 encyclical in which he called on Catholics worldwide to join in the fight against climate change.
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"If we don't turn back," he concluded on Sunday, "we will go down."
"What do you think it means when your forests are on fire, your streets are underwater, and your buildings are collapsing?"
—Bill McKibben, 350.org
In a Guardian op-ed published Monday, titled "Stop talking right now about the threat of climate change. It's here; it's happening," 350.org co-founder Bill McKibben also described North America's natural disasters this past week, exacerbated by man-made global warming, as a sign that people and politicians must reduce reliance on dirty energy sources to address climate change.
Pointing to Houston's recovery efforts following Hurricane Harvey, west coast forest fires, a "flash drought" in the northwest, and Hurricane Irma battering Florida this weekend after ravaging several Caribbean islands, McKibben wrote: "That one long screed of news from one continent in one week (which could be written about many other continents and many other weeks—just check out the recent flooding in south Asia for instance) is a precise, pixelated portrait of a heating world."
"Because we have burned so much oil and gas and coal, we have put huge clouds of CO2 and methane in the air; because the structure of those molecules traps heat the planet has warmed; because the planet has warmed we can get heavier rainfalls, stronger winds, drier forests and fields," he continued.
Calling upon humankind to take a stand against the fossil fuel industry to curb global warming, McKibben likened the ongoing battle against oil and gas companies to "going on a war-like footing: not shooting at enemies, but focusing in the way that peoples and nations usually only focus when someone's shooting at them."
"And something is," he concluded. "What do you think it means when your forests are on fire, your streets are underwater, and your buildings are collapsing?"