إستطاعت الديناصورات التواجد لأن الغلاف الجوي للأرض آنذاك كان يحوي على كميات كبيرة من الأكسجين اما الآن فلا تستطيع الزواحف والبرمئيات النمو لتصبح لذلك الحجم الكبير مجددا
1- 38 ألف هي عدد الأشياء التي صنعها الإنسان ودارت على الأرض منذ إطلاق sputink سنة 1957
2- 22,000 هي عدد الأشياء التي صنعها الإنسان وتدور في مدار الارض والتي هي 10 سم أو أكبر
87%هي عبارة عن أقمار إصطناعية معطلة
5% أقمار إصطناعية فعالة
8% صواريخ مرسلة
3- تصل حرارة نواة الأرض إلى 5500 درجة مئوية وهي نفس حرارة سطح الشمس
4- 150 مليار دولار هي كلفة بناء محطة الفضاء الدولية, إذ تعد أغلى شيئ صنعه الإنسان وقد تم بدأ بنائها منذ
5- 8,6 مليون هو عدد الصواعق التي تضرب الأرض يوميا
6- نسبة المياه النقية على الأرض هي 3% فقط
في المقابل 97% هي مالحة تماما
7- 90% من النشاطات البركانية تحدث في المحيطات
8- 106 مليار شخص عاش على سطح الكرة الأرضية ومن المقدر أن تصل تعداد البشرية بحلول سنة 2050 إلى 9,2 مليار شخص .
9- 100 طن من النيازك الصغيرة معظمها غبار تدخل الغلاف الجوي للأرض كل يوم
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