Sökning: "early Earth"

Visar resultat 1 - 5 av 341 avhandlingar innehållade orden early Earth.

  1. 1. Greening Earth? : Science, Politics and Land Use in the Kyoto Negotiations

    Författare :Eva Lövbrand; Bo Wiman; Bo Bergbäck; Karin Bäckstrand; Högskolan i Kalmar; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kyoto Protocol; Carbon cycle science; International climate politics; Land use change and forestry; carbon sinks; science-policy interface; co-production; Kyotoprotokollet; Internationell klimatpolitik; kolcykelforskning; kolsänkor; vetenskap och politik; markanvändning och skog; Biology; Biologi; Naturresurshushållning; Natural Resources Management;

    Sammanfattning : Can a deliberate enhancement of the natural uptake of atmospheric carbon dioxide in forests and agricultural lands contribute to global efforts to mitigate anthropogenic climate change? This is a question that has generated a great deal of debate and controversy since the inception of the multilateral climate negotiations in the early 1990s. This thesis offers an analysis of how this debate has played out in the negotiations on the land-use change and forestry activities in the Kyoto Protocol. LÄS MER

  3. 2. The Early Cambrian Fauna of North-East Greenland

    Författare :Christian B. Skovsted; John S. Peel; Lars E. Holmer; Gerd Geyer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Early Cambrian; Dyeran; Botoman; Biostratigraphy; Palaeogeography; Small Shelly Fossils; Brachiopoda; Mollusca; Hyolitha; Trilobita; Geovetenskap; Earth sciences; Geovetenskap;

    Sammanfattning : Small shelly fossils are common in sediments of Early Cambrian age and include the earliest common representatives of metazoan animals with mineralized hard parts. The group includes fossils of very different morphology, composition and ultrastructure. LÄS MER

  4. 3. Single fluid inclusion analysis using ToF-SIMS : Implications for ancient Earth biodiversiy and paleoenvironment studies

    Författare :Sandra Siljeström; Jukka Lausmaa; Andrew Steele; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ToF-SIMS; time-of-flight secondary ion mass spectrometry; fluid inclusions; biomarkers; hopanes; steranes; early life; paleoenvironment; oil; eukaryotes; Earth sciences; Geovetenskap; geokemi; Geochemistry;

    Sammanfattning : When and how life first emerged on the Earth is an area of intense research. Signs of the first life on Earth, including morphological fossils, are scarce and hard to interpret. An alternative approach is to study organic biomarkers, which are molecular fossils commonly considered as bona fide biosignatures. LÄS MER

  5. 4. Neoproterozoic-Early Cambrian organic-walled microfossils : Ultrastructural and biogeochemical search for their affinities

    Författare :Nina M. Talyzina; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; Historical Geology and Paleontology; historisk geologi och paleontologi;

    Sammanfattning : The Neoproterozoic-Cambrian transition is marked by conspicuous radiation of skeletal fauna comparable to modern invertebrates. Phylogenetic relationships of living organisms, based on their genetic and ultrastructural complexity, suggest that most prokaryotic and protistan organisms should have evolved by the time of origination of coelomate organisms. LÄS MER

  7. 5. On the early Ordovician of Sweden : stratigraphy and fauna

    Författare :Torsten E. Tjernvik; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap;

    Sammanfattning : .... LÄS MER