An ecological paradigm shift from the "balance of nature" to the "flux of nature" will change the way we aesthetically appreciate nature if we adopt scientific cognitivism-the view that aesthetic appreciation of nature must be informed by scientific knowledge. Aesthetic judgments are subjective, though we talk about aesthetic qualities as if they were objectively inherent in objects, events, or environments. Aesthetic judgments regarding nature are correct insofar as they are part of a community consensus regarding the currently dominant scientific paradigm. Ecological science is grounded in metaphors: nature is a divine order, a machine, an organism, a community, or a cybernetic system. These metaphors stimulate and guide scientific practice, but do not exist independent of a conceptual framework. They are at most useful fictions in terms of how they reflect the values underlying a paradigm. Contemporary ecology is a science driven more by aesthetic than metaphysical considerations. I review concepts in the history of nature aesthetics such as the picturesque, the sublime, disinterestedness, and formalism. I propose an analogy: just as knowledge of art history and theory should inform aesthetic appreciation of art, knowledge of natural history and ecological theory should inform aesthetic appreciation of nature. The "framing problem," is the problem that natural environments are not discrete objects, so knowing what to focus on in an environment is difficult. The "fusion problem" is the problem of how to fuse the sensory aspect of aesthetic appreciation with highly theoretical scientific knowledge. I resolve these two problems by defending a normative version of the theory-laden observation thesis. Positive aesthetics is the view that insofar as nature is untouched by humans, it is always beautiful and never ugly. I defend an amended and updated version of positive aesthetics that is consistent with the central elements of contemporary ecology, and emphasize the heuristic, exegetical, and pedagogical roles aesthetic qualities play in ecological science.