Seeing as Adam was already sentenced to die, why did he receive the additional punishments mentioned here?
Seforno: The death-sentence was for eating from the fruit of the Etz ha'Da'as, as HaSh-m warned him, but not for listening to Chavah and accepting the Lashon ha'Ra that she spoke about HaSh-m, to whom she attributed the Midah of jealousy and said that He lied. For that, he was receiving the extra punishments.
How was the earth cursed?
Rashi: It will produce detested creatures, such as flies, beetles and ants. 1
Lev Eliyahu (Bereishis, p. 25): No food would have ever spoiled, until now that Adam sinned.
Gur Aryeh: Rashi found it difficult that the verse does not specify what the earth's curse would consist of.
Why was the earth punished together with Adam?
Rashi #2 (on 1:11): The earth was punished because it disobeyed Hashem's orders
Gur Aryeh: Rashi seems to combine two answers (also refer to 3:17:2:1) into one thought, while the Midrash presents them as two alternate explanations! Both explanations in the Midrash agree that the earth brought forth beetles et. al. According to its initial explanation, this constituted a curse for man. According to the second explanation, it was a curse for the earth itself, due to the parable cited by Rashi. Rashi is based on the second explanation in the Midrash.
DH Eitz P'ri.
See also Na'ar Yonasan.
Why was his punishment attributed to obeying his wife?
Ohr Yechezkel (Midos, p. 290): The Torah teaches that even though he thought that he was doing a Mitzvah (obeying his wife), it was the most severe Aveirah. All the more so we, who are not at his level (the angels wanted to sing Shirah before Adam 1 ), if we do not know evil, we can think that our bad deeds are Mitzvos!
Chochmah u'Musar (Vol. 2, p. 279): The ability that leads to sin 2 is worse than sin itself, for it contains many sins. One must uproot it, even a Chacham like Adam. This shows how much one must distance from Heter, lest he come to Isur!
Why were all generations punished for Adam's sin?
Lev Eliyahu (Bereishis, p. 38): Before the sin, Adam's body was clear, and he benefited from the Shechinah in Gan Eden. Through the sin, his entire body became sick and physical. He cannot benefit from the radiance of the Shechinah, and has no place in Gan Eden, until the Ru'ach separates from the body. It is not a fine
QUESTIONS ON RASHI
Rashi writes: "This is comparable to someone who strayed off the proper path...." But earlier (Rashi to 1:11), Rashi wrote that the earth was cursed at this point due to its own sin
Gur Aryeh (to 1:11): These are two differing opinions in the Midrash (refer to 1:11:3:1**). According to the view Rashi cites in 1:11, the earth itself sinned; while according to this Midrash, the earth brought about man's sin. 1