一位硕士的毕业答辩论文，需要翻译其中一段

随着人类对自然环境的开发，全球气候出现了很大程度的改变，气候的变化已经引起了各国政府、研究界及公众的广泛关注。对于生态系统和社会经济发展而言，气候变化可能造成很多灾难，而农业作为对气候条件依赖度较高的行业，在气候变化背景下面临很多发展问题。我国是人多地少的人口大国，保持各农作物生产的稳定增长，确保国家粮食安全尤其口粮安全，一直是我国农业政策的核心目标。 The climate of earth has changed significantly thanks in part to human activity. Climate change has attracted extensive attention from governments, research sector, and the general public. For one thing, it may bring many disastrous events to ecological system and social economic development. Agricultural sector, which is highly dependent on climate condition, faces many development issues against the background of climate change. For China, a country with vast population and limited arable land, maintaining the steady growth of agricultural production, and ensuring food security for the country, secure supply of s

论文几经修改，译文也跟着修改。