π€ π UNITED STATES • HERITAGE OBSERVANCE National Day of the American Cowboy Fourth Saturday of July Celebrating the Spirit, Heritage, and Enduring Legacy of the American West Observed on the fourth Saturday of July , the National Day of the American Cowboy celebrates the rich heritage and enduring influence of the American cowboy. More than a legendary figure of the Old West, the cowboy represents values such as integrity, courage, hard work, self-reliance, stewardship of the land, and a pioneering spirit that helped shape the history and culture of the United States. π
Observed Fourth Saturday of July π€ Honors The traditions, history, and cultural contributions of American cowboys. π Celebrated Through Rodeos, parades, ranch events, music, and Western heritage festivals. π The Legacy of the American Cowboy The cowboy emerged during the nineteenth century as ranching expanded across the American ...
It
doesn’t! The oxygen level of the planet has varied quite dramatically in the
last 500 million years. It was 35 per cent during the Carboniferous period, around
300 million years ago; as the climate, cooled and land plants died off, oxygen
fell to as low as 12 per cent by the beginning of the Triassic. Back then, the
air at sea level would have felt thinner than at the top of the Alps today.
Burning
fossil fuels has reduced oxygen levels very slightly – about 0.057 per cent
over the last 30 years. Deforestation only has a small effect because when
rainforest is cut down, other plants are usually grown in its place. But it’s
marine phytoplankton (plant plankton), rather than trees, that produces about
75 per cent of atmospheric oxygen. Global warming will have a significant
impact on phytoplankton, which is a much more serious threat to oxygen levels.



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