What Rav Kook says we must do immediately to save the world:

From the blog of Itzchak Evan-Shayish at The Times of Israel

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Israel , Kohelet Rabba , Bemhera Beyamenu , Rav Kook , Yisurim Memarkim , , Midrash Kohelet Rabba , Orot Hatshuva Lights Of Return , Rav Avraham Yitzchak Hacohen Kook , Yisurim Memarkim Pangs , Third Commandment ,