White-flowering Arabidopsis growing in sand at a beach near the Baltic sea. The plant, a member of the mustard family, grows in a broad range of climates, from alpine to desert, and is commonly used in genetic experiments in the lab.
Moisés Expósito-Alonso/UC Berkeley
You won’t need to spend long on a creationist social media site before someone demands evidence of “observed evolution”, only to shift the goalposts the moment you provide exactly that: measurable changes in allele frequencies within a population in response to environmental change. At that point, they usually abandon the scientific definition of evolution and retreat instead to one of their childish caricatures of it — one species suddenly turning into an unrelated taxon, new structures appearing overnight, or, most absurdly of all, unable to let go of the arrogant assumption that the entire universe has a single purpose - to produce them - a bacterium somehow “becoming human”, as though evolution had a preordained anthropocentric goal.
So we can predict with some confidence how creationists will react to news that science has now published precisely the sort of evidence they keep demanding. In a paper published on 26 March 2026 in the journal Science, a team led by Assistant Professor Moisés Expósito-Alonso of the University of California, Berkeley, reported the results of a remarkable outdoor evolution experiment designed to measure how quickly plants can adapt to changing climates. The researchers planted genetically diverse populations of the common laboratory plant Arabidopsis thaliana across 30 climate zones in Western Europe, the Mediterranean, the Middle East and North America, ranging from the snowy Alps to the heat of the Negev Desert, and tracked the evolutionary changes over five years.
Of course, the purpose of the experiment was not to “test” the Theory of Evolution. Evolutionary theory was the framework on which the entire study was built and by which the results were interpreted. The aim was to observe evolution in real time and discover how quickly plant populations can adapt to climate change — and where the limits of that adaptive capacity may lie.
An early analysis of the first three years of genomic data — covering 12 plots at each of the 30 sites, 360 experiments in total — showed that most populations evolved rapidly in response to their new environments. In many locations, similar genetic changes appeared repeatedly, exactly as one would expect when natural selection favours variants suited to local conditions. In the hottest environments, however, the pattern was different: although some populations showed genetic change, it appeared chaotic rather than predictably adaptive, and these populations subsequently went extinct.
If this pattern proves typical of other plant species, it is deeply concerning, because rising global temperatures are precisely the conditions to which many plants will now need to adapt if they are to avoid climate-driven extinction. The study suggests that rapid adaptation is possible, but also that there may be a tipping point beyond which extreme heat pushes populations past an evolutionary breaking point.











































