SAVE OUR EARTH 　
The Earth gets more polluted everyday.So Earth Day was founded.Everyspring,people all over the world participate in Earth Day events.They plant trees and they promise to save energy and water. 　
Earth Day is regared as the first environmental movements.It gives us the opportunities to think about the environmental problems and solutions. 　
Friends,let's save the Earth together! 　 　
译文： 拯救我们的地球 　
地球每天都在被污染。所以地球日成立了。每个春天，全世界人民参加地球日活动。他们植树而且他们还承诺节约能源和水资源。 　
地球日被称为第一个现代的环境活动，它给我们机会去考虑环境问题和解决方法。 　
朋友们，让我们一起拯救地球吧！ 　
Earth, of course, can be studied without the aid of spacecraft. Nevertheless it was not until the twentieth century that we had maps of the entire planet. Pictures of the planet taken from space are of considerable importance; for example, they are an enormous help in weather prediction and especially in tracking and predicting hurricanes. And they are extraordinarily beautiful.
The core is probably composed mostly of iron (or nickel/iron) though it is possible that some lighter elements may be present, too. Temperatures at the center of the core may be as high as 7500 K, hotter than the surface of the sun. The lower mantle is probably mostly silicon, magnesium and oxygen with some iron, calcium and aluminum. The upper mantle is mostly olivene and pyroxene (iron/magnesium silicetes), calcium and aluminum. We know most of this only from seismic techniques; samples from the upper mantle arrive at the surface as lava from volcanoes but the majority of the Earth is inaccessible. The crust is primarily quartz (silicon dioxide) and other silicates like feldspar

Our Good Earth 我们的地球Can the Obamas Turn the White House Green?
By Eliza Barclay July 7, 2009

When First Lady Michelle Obama boldly broke ground on an organic vegetable, fruit, and herb garden on the South Lawn of the White House this year, the administration sent a strong message about its plan to “walk the talk” on health and the environment.

The Obamas are not the first presidential couple to flaunt their environmental consciousness at home. Past presidents like Bill Clinton and Jimmy Carter cut back on energy use in the White House, and George W. Bush installed a small photovoltaic system and two solar water-heating systems. But in its first hundred days, the Obama administration indicated it plans to go further than its predecessors, starting with the garden and moving soon to the White House Center—the complex of buildings and facilities at 1600 Pennsylvania Avenue.

According to government officials familiar with greening efforts, the Obama White House intends to be the first White House to earn LEED certification, a system developed by the U.S. Green Building Council (USGBC) to measure and reward buildings and communities that implement green building design, construction, operations, and maintenance.

“LEED certification of the White House is absolutely possible and viable,” said Rick Fedrizzi, CEO and president of USGBC, which has offered to help advise the White House on the process. However, Fedrizzi noted, it will not be easy because of the building’s historic status and the security required to protect the President and his family.

“A normal building is already a challenging assignment, and this is something that’s a historic structure, one of [the] nation’s most historic structures,” he says.

The Department of Energy’s (DOE) Federal Energy Management Program (FEMP) played a lead role in the White House greening effort under President Clinton, focusing on energy efficient lighting and heating. DOE partnered with the General Services Administration, the White House Ushers Office, the National Park Service, and experts from the fields of architecture, engineering, building management, and environmental health, according to the agency.

FEMP is teaming up again this year with a variety of agencies, including the White House Council on Environmental Quality (CEQ).

The Change We Need

According to Christine Glunz, spokeswoman for CEQ, the Obama greening effort will make changes in procurement, energy and water systems, and waste. Staff will consider toxicity and life cycle when making purchases for the facilities. They’ll buy biodegradable cleaners, equipment made with recycled content, and paints and sealers with low volatile organic compounds (VOCs).

“[We are] also improving the carbon footprint of our facility by identifying better ways to light, power, heat, and cool our buildings,” Glunz said in an email message, adding that the White House is indeed pursuing LEED certification.

当第一夫人米歇尔奥巴马大胆破土动工的有机蔬菜，水果和香草园南白宫南草坪，今年，政府发出了一个强有力的信息，其计划“一往无前谈话”对健康和环境。

该Obamas不是第一次总统夫妇标榜他们的环保意识在家里。过去的总统像克林顿和吉米卡特减少能源的使用在白宫和美国总统布什安装一个小型光伏发电系统和两个太阳能热水系统。但是，在其第一一百天，在奥巴马政府表示，它计划再进一步比其前身，从花园和移动很快白宫中心的复杂的建筑物和设施在1600年宾夕法尼亚大道。

据政府官员熟悉绿化努力，奥巴马白宫打算首先白宫获得绿色认证，系统开发的美国绿色建筑委员会（ USGBC ）来衡量和奖励建筑物和社区推行绿色建筑设计，建设，运营和维护。“绿色认证白宫是完全可能和可行的，说： ”里克Fedrizzi ，首席执行官兼总裁USGBC ，它愿意帮助提醒白宫的进程。然而，费德利兹 Fedrizzi指出，这将是不容易的，因为建设的历史地位和安全需要，以保护总统和他的家人。

“一个正常的建设已经是一个具有挑战性的任务，这是这是一个历史性的结构，其中一个[的]民族历史上最著名的结构， ”他说。

美国能源部（能源部）美国联邦能源管理计划（ FEMP ）发挥了主导作用在白宫绿化根据克林顿总统的努力，把重点放在节能照明和取暖。美国能源部与一般事务管理局，白宫迎来办公室，国家公园管理处，和专家等领域的设计，工程，建设管理，环境健康，根据该机构。

FEMP是联手今年再次与各种机构，包括白宫环境质量委员会（ CEQ ） 。

我们需要的变化

据克里斯蒂娜Glunz发言人CEQ ，奥巴马绿化的努力将改变采购，能源和供水系统，废物。工作人员将考虑毒性和生命周期时，购买的便利。他们将购买可生物降解的清洁剂，设备与回收内容，油漆和封口低挥发性有机化合物（ VOCs ） 。

“ [我们]也提高碳足迹，我们的设施，确定更好的方式来轻，功耗，热量和冷却的建筑物， ” Glunz说，在一封电子邮件，并补充说，白宫的确是追求绿色认证。

CEQ正在寻找各种各样的战略，以减少能源的使用，通过计算机化的能源管理系统;供暖，通风和空调系统，适应不同的功率要求;自动光感应器，关掉灯无人居住的地区;低流量水阀在厕所;和处置设备就像空调排放臭氧破坏氯氟化碳（ CFCs ） 。这些步骤将获得积分的绿色系统，并可能增加不足以赢得更高的认证级别，银，金，或白金。

USGBC的Fedrizzi说，一般玻璃可以更换节能设备，但将难以在白宫，因为它们的外部历史性玻璃。但是他说，他们可以申请窗口薄膜减少紫外线。

该小组还攻击白宫中心的废物流，并培训员工使用再生纸的内容只要有可能。 Glunz指出，他们希望能捐出剩余翻修拆建物料循环再用，以地方组织。

户外活动，在菜园， 3月20日开始，将有55个品种的蔬菜，以及蜂巢的蜂蜜，草药，和浆果。这是第一菜园在白宫因为埃莉诺罗斯福种植园在二战的胜利。女孩的奥巴马也将扮演一个无农药挥杆设置。

我们的地球

Our Good Earth