Extensive empirical evidence from multiple independent global temperature and climate datasets directly refutes the claim that unadjusted climate data shows no long-term global warming.
The claim is specific and empirical, allowing for direct verification through climate science literature. None of the provided papers support the assertion that unadjusted climate data shows no warming; instead, papers such as [1], [2], [3], and [9] utilize instrumental and historical datasets to establish clear, robust, long-term global warming trends. Therefore, the evidence strongly refutes the claim.