העוסקים בנושא שינויי האקלים וההתחממות הגלובלית "מאיימים" כי הקרחונים בעולם הולכים ומפשירים בקצב מוגבר, ולכן צפויה…

פרופ' מיכה קליין | 12 בדצמבר 2021 | מחשבות | 5 דק׳

האם הקרחונים באמת נמסים וגורמים לעליית מפלס פני הים?

העוסקים בנושא שינויי האקלים וההתחממות הגלובלית "מאיימים" כי הקרחונים בעולם הולכים ומפשירים בקצב מוגבר, ולכן צפויה עלייה מהירה בגובה פני הים בעתיד הקרוב. לפני שאציג את הנתונים ביחס לקרחוני העולם יש להכיר כמה עובדות:

1. קרחון הצף על המים ונמס לא יעלה את גובה פני הים (חוק ארכימדס). תדמיינו קוביית קרח שנמסה לאיטה במשקה שלכם – היא אינה מעלה את גובה המשקה בכוס השתייה.

2. "מדף קרח" גם הוא צף על פני מים ולכן גושי הקרח הענקיים הנשברים לא יעלו את גובה פני הים.

רוצה לקרוא עוד?

להמשך קריאה הירשמו או התחברו

Shutterstock

Shutterstock

מה שבאמת דחף את נמסיס להשלים את השינוי ולהפוך לגיבור היה אמונתו התמימה של סם בכך שהוא כזה מלכתחילה

אפקט פיגמליון וגיבורי-על: כשאמונה יוצרת גבורה

ד"ר משה רט

מחנה פליטים בג׳באליה

הצעד הראשון ליישום תוכנית ההגירה של טראמפ | דעה

יוני בן מנחם

אילוסטרציה: מגזין אפוק

אף אחד אחר לא אחראי על המעשים שלנו | דעה

ד"ר משה רט

צילום: Shutterstock

איום בגובה נמוך: מי עומד מאחורי הרחפנים הבלתי מזוהים מעל הבסיסים האמריקניים בארה"ב ובאירופה?

אורן שלום

צמצום הכנסות המט"ח יגרום להיחלשות המטבע שיגרום לשורה של בעיות כלכליות

כיצד אמור להתמוטט המשטר האיראני? | פרשנות

איל לוינטר

אילוסטרציה: מגזין אפוק

לשפשף את העיניים: מצרים עורכת שינויים בספרי הלימוד כדי להסיר תוכן אנטישמי

מאיה מזרחי

הירשמו לניוזלטר שלנו וקבלו תוכן חדש למייל מדי חודש

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