Quick answers to questions that deserve more than a single sentence, but not a full profile — the kind of "wait, why does that number vary so much?" moments that come up across our reporting.
Different studies measure different things: some count only visible surface plastic, others model total input including material that sinks or fragments into microplastics before reaching survey instruments. The 14x range reflects genuinely different measurement scopes and modeling assumptions, not sloppy science — and no single figure in that range should be treated as "the" number.
Full profile: Ocean Pollution →In 2017 the IUCN moved the snow leopard from Endangered to Vulnerable — but its own assessment explicitly said this reflected better survey methodology (camera traps, genetic sampling) resolving previous uncertainty, not a documented population increase. Status changes on the Red List can reflect improved data as easily as improved conservation outcomes, and the two are easy to conflate in headlines.
Full profile: Snow Leopard →Satellite tree-cover-loss data doesn't distinguish clearcut-and-replant forestry or wildfire regrowth from permanent agricultural conversion. In temperate and boreal forests, around 98% of tree cover loss since 2000 falls into the "temporary" category; in the tropics, the reverse is true — most loss is permanent conversion. The same headline statistic ("X million hectares lost") can describe very different realities depending on where it's measured.
Full profile: Temperate Forests →Before 2021, one combined Red List assessment blurred together forest elephants (down 86% over 31 years, now Critically Endangered) and savanna elephants (down 60%+, Endangered) — two genetically distinct species with different threats and different population trajectories. Aggregated statistics can hide the fact that one group is in a considerably more urgent crisis than the other.
Full profile: African Elephant →The commonly cited $423 billion/year global cost figure counts direct, well-documented damages (crop losses, control programs); newer 2025 research argues the true figure — including indirect costs like ecosystem service loss — may run as much as 16 times higher. Both figures are legitimate; they're just measuring different things.
Full profile: Invasive Species →The popular narrative — wolves reduced elk browsing, which let riparian vegetation recover, which changed river behavior — is a real hypothesis with real supporting research. But several ecologists argue climate, elk hunting outside the park, and other factors share credit, and the scale of the effect remains actively debated in the scientific literature, not settled fact.
Full profile: Grey Wolf →Evidence Briefs are shorter and more informal than our full profiles, but follow the same sourcing standard — every claim links back to a profile with full citations.